Question

A frog leaps vertically into the air and encounters no appreciable air resistance.
A. On the way up its acceleration is 9.8 upward, and on the way down its acceleration is 9.8 downward.
B. On the way up and on the way down its acceleration is 9.8 downward, and at the highest point its acceleration is zero.
C. On the way up, on the way down, and at the highest point its acceleration is 9.8downward.
D. At the highest point, it reverses the direction of its acceleration.

Answer 1

A
If the acceleration was upward while going up, the frog would have kept going up.
B
If the acceleration on the highest point was zero, the frog would have remained in mid air.
C
This is the right answer, because the acceleration is continuously downwards and therefore he stops going up and starts coming down.
D
This would make no sense because if the acceleration changes at the highest point, then the frog would have never been able to come down...


Always remember, the acceleration of Earth is 9.8 downwards.
Answer is C