A car of mass 400 kg and travelling at 72km/hr crashes into a truck of mass 4000 kg and travelling at 9 km/hr in the same direction. The car bounces back at a speed of 18 km/hr. The speed of the truck after the impact is:
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a
9 km/hr
b
18 km/hr
c
27 km/hr
d
36 km/hr
answer is B.
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Detailed Solution
From COLM,400(72)+4000(9)=400(−18)+4000(v)v=18km/hr