Momentum of ball bouncing off wall

aszymans

1. The problem statement, all variables and given/known data
A racquet ball with mass m = 0.247 kg is moving toward the wall at v = 12.4 m/s and at an angle of θ = 32° with respect to the horizontal. The ball makes a perfectly elastic collision with the solid, frictionless wall and rebounds at the same angle with respect to the horizontal. The ball is in contact with the wall for t = 0.063 s.


2. Relevant equations
What is the magnitude of the change in momentum of the racquet ball?


3. The attempt at a solution
I found the initial P already and am not sure if I should use the (delta)P= F(net)* (delta)t and use 1-d kinematics to find acceleration or how exactly to begin.

grzz

Since the collision is assumed to be perfectly elastic, try using conservation of KE.

grzz

Then find the change in momentum.

HallsofIvy

Momentum is a vector quantity. The component of momentum parallel to the way will not change. The component of momentum perpendicular to the way is multiplied by -1.