Chapter 2. Velocity, acceleration, and position for free fall (2-15)

Question

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{"title":"velocity at position y","description":"Correct!","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,20,28,48\"}]"} {"title":"velocity at position y sub 0","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"61,19,86,54\"},{\"shape\":\"rect\",\"coords\":\"71,54,71,65\"}]"} {"title":"Acceleration due to gravity","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"161,23,187,54\"}]"} {"title":"position of object when it has velocity v sub y","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"198,22,218,52\"}]"} {"title":"position of object when it has velocity v sub 0y","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"256,23,276,54\"}]"}

Question

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{"title":"velocity at position y","description":"Incorrect","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,20,28,48\"}]"} {"title":"velocity at position y sub 0","description":"Correct!","type":"correct","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"61,19,86,54\"},{\"shape\":\"rect\",\"coords\":\"71,54,71,65\"}]"} {"title":"Acceleration due to gravity","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"161,23,187,54\"}]"} {"title":"position of object when it has velocity v sub y","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"198,22,218,52\"}]"} {"title":"position of object when it has velocity v sub 0y","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"256,23,276,54\"}]"}

Question

qNqJQkhgXuzxx9T65ffLEKi1okKO74D+3qaruQDnMvmfcNoQqbXS55+vpj0=

{"title":"velocity at position y","description":"Incorrect","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,20,28,48\"}]"} {"title":"velocity at position y sub 0","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"61,19,86,54\"},{\"shape\":\"rect\",\"coords\":\"71,54,71,65\"}]"} {"title":"Acceleration due to gravity","description":"Correct!","type":"correct","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"161,23,187,54\"}]"} {"title":"position of object when it has velocity v sub y","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"198,22,218,52\"}]"} {"title":"position of object when it has velocity v sub 0y","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"256,23,276,54\"}]"}

Question

JaAVZvi+Zcw4U9RQ7ljZ7cNilKiyjKKacy2sfVnxWWcM2VykgVO6uq5ikeHISXS/7Cb9xf2U9TquygptxpOo/Q==

{"title":"velocity at position y","description":"Incorrect","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,20,28,48\"}]"} {"title":"velocity at position y sub 0","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"61,19,86,54\"},{\"shape\":\"rect\",\"coords\":\"71,54,71,65\"}]"} {"title":"Acceleration due to gravity","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"161,23,187,54\"}]"} {"title":"position of object when it has velocity v sub y","description":"Correct!","type":"correct","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"198,22,218,52\"}]"} {"title":"position of object when it has velocity v sub 0y","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"256,23,276,54\"}]"}

Question

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{"title":"velocity at position y","description":"Incorrect","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,20,28,48\"}]"} {"title":"velocity at position y sub 0","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"61,19,86,54\"},{\"shape\":\"rect\",\"coords\":\"71,54,71,65\"}]"} {"title":"Acceleration due to gravity","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"161,23,187,54\"}]"} {"title":"position of object when it has velocity v sub y","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"198,22,218,52\"}]"} {"title":"position of object when it has velocity v sub 0y","description":"Correct!","type":"correct","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"256,23,276,54\"}]"}

Review

Note the minus sign in front of each term containing \(g\), which is a reminder that the acceleration is always downward, in the negative \(y\) direction. If a freely falling object is rising, it slows down; if the object is descending, it speeds up.