A.    If an object is released from rest, the height it has fallen is in proportion to time.
    B.    If an object is released from rest, its falling speed is in proportion to time.
    C.    If an object is released from rest, its falling speed is in proportion to the square root of the height it has fallen.
    D.    The acceleration due to gravity on Moon's surface is smaller than that on Earth's surface.
    E.    Ignoring air resistance, all objects fall with roughly the same acceleration due to gravity near Earth's surface.

    Ans.    A

V.

For the above x-t curve, at which of the following given time the object has zero velocity?

    A.    t = 0s
    B.    t = 1s
    C.    t = 2.5s
    D.    t = 4s
    E.    t = 4.5s

    Ans.     C