Homework Help: college physics

Posted by patti on Friday, March 15, 2013 at 7:12pm.

if a 12kg ball rolls down a ramp at 3 m/s and crashes into a pillow and it takes 0.65 s to stop the ball what is the momentum of the ball and the force exerted by the pillow? I would like to know the formula on how to figure this out.

college physics - drwls, Friday, March 15, 2013 at 10:45pm
Momentum before impact = M*V = 12*3
= 36 kg m/s.

Force exerted = Impulse / decel. time)
= (Momentum change)/(deceleration time)
= 36/0.63 = ___ Newtons

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