A ball with a mass of $2 kg$ is rolling at $12 m/s$ and elastically collides with a resting ball with a mass of $1 kg$ . What are the post-collision velocities of the balls?

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Answer 1 · 2016-02-08T13:23:33

$v_1=4 m/sec$
$v_2=16 m/sec$

$2*12+1*0=2*v_1+1*v_2$
$24=2*v_1+v_2$
$12+v_1=v_2$
$24=2*v_1+12+v_1$
$24-12=3*v1$
$12=3*v_1$
$v_1=4 m/sec$
$12+4=v_2$
$v_2=16 m/sec$

A ball with a mass of 2 kg2 kg is rolling at 12 m/s12 m/s and elastically collides with a resting ball with a mass of 1 kg1 kg. What are the post-collision velocities of the balls?