A basketball with a mass of 0.5 kg is bounced on the floor.Right before impact,it has a speed of 10 m/s,and right after it has 8 m/s.What is the impulse of the collision,and of which type is the collision?
A)1 Ns,elastic
B)5 Ns,elastic
C)9 Ns,elastic
D)1 Ns inelastic
E)9 Ns,inelastic

Question

Quizplus · Accepted Answer

Impulse is given by the change in momentum, which is mass times change in velocity. Here, the change in velocity is from 10 m/s to -8 m/s (since the direction changes upon bouncing), so the total change in velocity is 18 m/s. The impulse is therefore 0.5 kg * 18 m/s = 9 Ns. The collision is inelastic because the ball does not return to its original speed, indicating energy is not conserved in terms of kinetic energy.

A Basketball with a Mass of 0