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Q.

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 ms-1, The speed with which the bullet hit the thief’s car is 

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a

180 m/s

b

42 m/s

c

105 m/s

d

145 m/s

answer is B.

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Detailed Solution

detailed_solution_thumbnail

VTP = VT – VP = 192 – 30
= 162 km/h = 45 m/s
VBT = 150 – 45 = 105 m/s

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