Question

a ball of mass 3 kg is moving with a velocity of 10 m/s. This ball collides with a second ball of mass 0.5 kg that is at rest. After the collison, the first ball is at rest. What is the velocity after the collison of the second ball if the collison is inelastic?

Answer 1

Inelastic collisions do not conserve kinetic energy, but they do conserve momentum.

3*10 + .5*0 = 3*0 + .5*v
30 = .5v
v = 60 m/s

Answer 2

M1v1 +M1v1=(m1+m2)v (3*10) + (0.5*0)=(3+0.5)v 30 + 0 = 3.5v 30 =3.5v v =8.57m/s.