Chapter 2. Position, acceleration, and time for free fall (2-14)

Question

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{"title":"Position at time t","description":"Correct!","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,27,28,55\"}]"} {"title":"position at time = 0","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"55,24,80,59\"},{\"shape\":\"rect\",\"coords\":\"71,54,71,65\"}]"} {"title":"velocity at time t = 0","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"121,24,147,55\"}]"} {"title":"time at position y","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"271,25,291,55\"},{\"shape\":\"rect\",\"coords\":\"167,24,187,54\"}]"} {"title":"Acceleration due to gravity","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"245,23,271,60\"}]"}

Question

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{"title":"Position at time t","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,27,28,55\"}]"} {"title":"position at time = 0","description":"Correct!","type":"correct","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"55,24,80,59\"},{\"shape\":\"rect\",\"coords\":\"71,54,71,65\"}]"} {"title":"velocity at time t = 0","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"121,24,147,55\"}]"} {"title":"time at position y","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"271,25,291,55\"},{\"shape\":\"rect\",\"coords\":\"167,24,187,54\"}]"} {"title":"Acceleration due to gravity","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"245,23,271,60\"}]"}

Question

o5imF64SOHPMxMuWiaGwPJxACzh4SzJubbrIQSqRw4f+/0aKomoYoVJg06h0PbwuNSxmydXAbiI1oq12A9fYRJcWcSx7rhII

{"title":"Position at time t","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,27,28,55\"}]"} {"title":"position at time = 0","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"55,24,80,59\"},{\"shape\":\"rect\",\"coords\":\"71,54,71,65\"}]"} {"title":"velocity at time t = 0","description":"Correct!","type":"correct","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"121,24,147,55\"}]"} {"title":"time at position y","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"271,25,291,55\"},{\"shape\":\"rect\",\"coords\":\"167,24,187,54\"}]"} {"title":"Acceleration due to gravity","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"245,23,271,60\"}]"}

Question

c3HS+V6urK8Yez++TKlD28UuxBZLzcFsysorO562DTg1pz6YN4Fp1Lzgk7S9zNPESqHi0ywRXMONcvY3HxRNKw==

{"title":"Position at time t","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,27,28,55\"}]"} {"title":"position at time = 0","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"55,24,80,59\"},{\"shape\":\"rect\",\"coords\":\"71,54,71,65\"}]"} {"title":"velocity at time t = 0","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"121,24,147,55\"}]"} {"title":"time at position y","description":"Correct!","type":"correct","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"271,25,291,55\"},{\"shape\":\"rect\",\"coords\":\"167,24,187,54\"}]"} {"title":"Acceleration due to gravity","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"245,23,271,60\"}]"}

Question

qNqJQkhgXuzxx9T65ffLEKi1okKO74D+3qaruQDnMvmfcNoQqbXS55+vpj0=

{"title":"Position at time t","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,27,28,55\"}]"} {"title":"position at time = 0","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"55,24,80,59\"},{\"shape\":\"rect\",\"coords\":\"71,54,71,65\"}]"} {"title":"velocity at time t = 0","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"121,24,147,55\"}]"} {"title":"time at position y","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"271,25,291,55\"},{\"shape\":\"rect\",\"coords\":\"167,24,187,54\"}]"} {"title":"Acceleration due to gravity","description":"Correct!","type":"correct","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"245,23,271,60\"}]"}

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.