a rubber ball is thrown against a horizontal wall and bounces back with the same speed it came in at. The change in momentum vector of the ball is

Question

A) 10 m/s^2

B) in the same directions the ball's initial motion

C) in the opposite direction as the ball's initial motion

D) zero

Answer 1

The units of A) are acceleration, m/s^2 , not momentum which is mass * velocity so NO WAY

If it reversed direction of velocity without changing sign of momentum
then
obviously it came back with NEGATIVE MASS !
so NO WAY

C) well all right

D ) LOL, it was thrown at zero speed ? Perhaps the mass was zero?