Q23 of 124 Page 55

What is the change in momentum of a car weighing 1500 kg when its speed increases from 36 km/h to 72 km/h uniformly?

The formula of change in momentum= mv - mu,

Where m = mass i.e. 1500kg,


v = final velocity i.e. 72 km/hr,


u = initial velocity i.e. 36 km/hr.


We will change the v and u to m/s


i.e. 72 X 5/18=20 m/s and 36 X 5/18=10 m/s.


Hence, change in Momentum= mv - mu


= 1500X20 - 1500X10


=1500[20 - 10]


= 1500 X 10


= 15000 kg m/s


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