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A student weighing 65 kg moving at 1.5 m/s runs into a student at rest weighing 45 kg. Rhe heavier student continues forward with a speed of 0.5 m/s after the crash. How fast is the smaller student moving after the crash? (in m/s)

 

Please help with this problem. Thanks!

 Jan 23, 2018
 #1
avatar+18433 
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I think this is a conservation of momentum type problem

 

Momentum before crash = momentum after crash

65 kg x 1.5 m/s  = 65 kg x .5m/s  + 45 kg x ? m/s

97.5 = 32.5 + 45 x?

?= 1.44 m/s

 Jan 23, 2018
 #2
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Thanks!

Cent0rea88  Jan 23, 2018

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