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Q 3.18     A police van moving on a highway with a speed of 30 km h-1 fires a bullet at a thief’s car speeding away in the same direction with a speed of 192 km h-1. If the muzzle speed of the bullet is 150 m s-1, with what speed does the bullet hit the thief’s car ?

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Muzzle speed of the bullet is VB=150 m s-1=540 km h-1

Speed of the Police van is VV=30 km h-1

Resultant Speed of the bullet is V=540+30=570 km h-1        

Speed of the thief's car= VT=192 km h-1

The speed with which the bullet hits the thief's car=V-VT=570-192=378 km h-1 =105 m s-1

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Sayak

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