Question

Truck is moving with a speed of 15 m/ sec . a car chasing this truck with a speed of 10 m/ sec fires a bullet a truck with muzzle velocity 90 km / h. The speed with which the bullet hit the truck is : (1) 15 m/sec . (2) 20 m/sec (3) 25m/sec (4) 30 m/sec

Answer 1

speed of truck=15 m/s
speed of car=10m/s
speed of bullet= 90 km/h x 5/18=25m/s
speed of the bullet with respect to a stationary point on ground
= (speed of car+ speed of bullet)-speed of truck
=10+25-15=20 m/s
or 20m/sx 18/5 = 72 km/h

Answer 2

Answer:

20m/s

Explanation: