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Q.

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

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a

250 m/s

b

150 m/s

c

27 m/s

d

450 m/s

answer is A.

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Detailed Solution

Effective speed of the bullet

= Speed of bullet + speed of police jeep

=180 m/s + 45 km/h

= (180 +12.5) m/ s =192.5m/ s

Speed of thief’s jeep =153 km/h = 42.5 m/s

Velocity of bullet w.r.t. thief’s car

=192.5 – 42.5 =150 m/s

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