Question

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 it will strike the car of the thief is

• A. 150 m/s
• B. 27 m/s
• C. 450 m/s
• D. 250 m/s

Answer 1

The correct option is A 150 m/s

Effective speed of the bullet
=speed of bullet + speed of police jeep
=180 m/s+45 km/h =(180+12.5)m/s=192.5 m/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