A ball of mass 0.75kg moving horizontally at 5m/s strikes a vertical wall and rebounds with a speed of 2m/s.find (a)what is the impulse received by the ball?(b)calculate the coefficient of restitution(c)calculate the kinetic energy of the ball before and after collision.

Answer 1

impulse is change of momentum
.75 * 7 kg m/s or Newton seconds

final speed/initial speed = 2/5

(1/2) .75 (25)
(1/2) .75 (4)

Answer 2

I don't understand