A 10 kg  ball and 20 kg ball approach  each  other with velocities `20 ms^(-1)` and   `
Channel: Doubtnut
Date: 2020-08-30

A 10 kg  ball and 20 kg ball approach  each  other with velocities `20 ms^(-1)` and   ` 10 ms^(-1)` respectively   . What are their velocities  after  collision if the collision is perfectly   elastic ?