Question

If a ball of mass 1 kg rolls with a speed of 2 m/s toward another ball of mass 1.5 kg at rest, what would be their combined speed if they stick together after colliding?

Answer 1

`V=0.8\;\;m/s`

Step-by-step explanation:

Given,

Mass of first ball
`m_1=1\; kg`

Mass of second ball
`m_2=1.5\;kg`

Initial speed of the first ball
`u_1=2\;m/s`

The second ball is initially at rest. So, by the conservation of momentum

`p_i=p_f\\m_1u_1+m_2u_2=(m_1+m_2)V\\1*2+1.5*0=(1+1.5)V\\V=0.8\;\;m/s`