Answers

2014-07-29T09:34:48+05:30
U=20m/s
V=0.20m/s
m=5kg
Final momentum= mv
                         = 5*0.20
                         =1.00
Initial momentum= mu
                         =5*20
                         =100
Change in momentum=mv-mu
                                =1-100
                                 -99kgm/s
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2014-07-29T09:37:21+05:30

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Momentum is defined as mass times velocity and its a vector with same direction as veloctity.
We assume the direction of velocity remained the same and only magnitude changed here.

Initial momentum  =  P1 = m u = 5 kg * 20 m/s = 100 kg m/s
Final momentum  = P2  = m v  =  5kg * 0.2 m/s  =  1 kg m/s
Chagne in momentum  = P2 - P1 =  1- 100 = - 99  kg m/s

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