Question
Thu September 24, 2009 By: Benjamin Tennyson

Force and laws of motion

Expert Reply
Fri September 25, 2009

Change in linear momentum = Pfinal - Pinitial

= mvfinal - mvinitial

= m (vfinal - vinitial) = 0.2 kg(-5m/s - 10m/s) = - 3 kgm/s

Note that 10 m/s, the initial velocity is taken as positive, because we assume that direction as positive, but when the hockey ball returns the direction is changed and is opposite so the final velocity is -5 m/s.

 

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