Forces and momentum

Question

A ball of mass 0.125 kg moves with a velocity of 2 m/s. The ball hits another ball of mass 1 kg that is initially at rest. After the collision, the first ball recoils with a velocity of 1.5 m/s. Calculate the velocity of the second mass.

a	0.70 m/s
b	0.44 m/s
c	1 m/s

Answer 1

Option b is correct

Linear momentum before collision = Linear momentum after collision ( Momentum = mass* velocity )

0.125 * 2 + 1*0 = -0.125*1.5 + 1* V

0.25 = - 0.1875 + v

V = 0.25 + 0.1875 = 0.4375 m/s

rounding to the nearest

V = 0.44m/s