Chapter 2. Velocity, acceleration, and time for free fall (2-13)

Question

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{"title":"velocity at time t","description":"Correct!","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,26,28,54\"}]"} {"title":"velocity at time = 0","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"101,20,133,60\"}]"} {"title":"Acceleration due to gravity","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"229,19,261,67\"}]"} {"title":"time at v sub y","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"263,11,289,56\"}]"}

Question

iKiQDKGwDbIWUMqLpWNq+GUoPUMch4sTMewOQq9aWCf3tB4K4Lg4ezOof8tL+VHgJlPA9iGpaosEdsKMO5v9/YVCszW2YHrTWb9IMVH8qNtb7h6Y

{"title":"velocity at time t","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,26,28,54\"}]"} {"title":"velocity at time = 0","description":"Correct!","type":"correct","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"101,20,133,60\"}]"} {"title":"Acceleration due to gravity","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"229,19,261,67\"}]"} {"title":"time at v sub y","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"263,11,289,56\"}]"}

Question

/kQwpqfUjrpBwUiJPSSXJrzJ1tnaNqRkAyA5Kkqp5jNsq7xhojbqBrIz1lE=

{"title":"velocity at time t","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,26,28,54\"}]"} {"title":"velocity at time = 0","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"101,20,133,60\"}]"} {"title":"Acceleration due to gravity","description":"Correct!","type":"correct","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"229,19,261,67\"}]"} {"title":"time at v sub y","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"263,11,289,56\"}]"}

Question

YjGSAozV0fL8C+40jTTURYiweMqRjeUx1vibwHHV32zREjP2aArCkmv8m0xvj+kvlstX6wQvwJ+YU31McRbc+A==

{"title":"velocity at time t","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,26,28,54\"}]"} {"title":"velocity at time = 0","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"101,20,133,60\"}]"} {"title":"Acceleration due to gravity","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"229,19,261,67\"}]"} {"title":"time at v sub y","description":"Correct!","type":"correct","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"263,11,289,56\"}]"}

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.