A ball with a mass of $9 kg$ moving at $15 m/s$ hits a still ball with a mass of $2 kg$ . If the first ball stops moving, how fast is the second ball moving?

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Answer 1 · 2016-02-10T17:36:42

$v=67,5 m/s$

$sum P_b=sum P_a$ $" sum of momentums before event ,must be equal sum of momentums after event"$
$9*15+0=0+2*v$
$135=2*v$
$v=135/2$
$v=67,5 m/s$

A ball with a mass of 9 kg9 kg moving at 15 m/s15 m/s hits a still ball with a mass of 2 kg2 kg. If the first ball stops moving, how fast is the second ball moving?