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Question

A police jeep is cheaping with velocity of 45 km/h, a theif in another jeep moving with velocity 153 km/h. Police fires a bullet with muzzle of 180 m/s. The velocity it will strike the car of the thief is :


A
150 m/s
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B
27 m/s
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C
450 m/s
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D
250 m/s
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Solution

The correct option is B 150 m/s
Here, we calculate the relative velocity of jeep 
= 153 - 45 = 108 km/h
$$ = 108 \times \dfrac {5}{18} = 30 m/s $$
Therefore, striking speed = relative speed of bullet with respect to theif's car.
= 180 - 30 = 150 m/s

Physics

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