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Question

# A police van moving on a highway with a speed of 30 km/h fires a bullet at a thief's car speeding away in the same direction with a speed of 192 km/h. If the nuzzle speed of the bullet is 150 m/s, with what speed does the bullet hit the thief's car?

A

105 m s1

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B

110 m s1

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C

115 m s1

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D

120 m s1

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Solution

## The correct option is A 105 m s−1 The speed of the bullet with respect to ground will be, vbg = vbv + vvg =150 + 253 = 4753ms−1 Speed of thief's car is, vtg=192 × 518 = 1603ms−1 vbt = vbg - vtg 4753 - 1603 = 105 ms−1

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