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 with which is will strike of 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