A ball of mass 0.50 kg moving at a speed of 5.0 m/s collides with another ball of mas 1.0 kg. After the collision the balls stick together ane remain motionless. What was the velocity of the 1.0 kg block before the collision?

Explanation

Mass of the ball
`m_1=0.5kg`
velocity of the ball =5m/s
Mass of the another ball `=m_2=1kg`
Let it's velocity `=v_1m/s`
Using law of conversation if momentum
`0.5xx5+1v^1=0`
`rarr v^1=-2.5`
`:. ` Velocity of second ball is 2.5 m/s opposite of the direction of motion of 1st ball.