Solution to problems – class 9 physics – Set 1 Q 58

Last updated on February 12th, 2022 at 03:26 pm

Problem Statement

58) A heavy car A of mass 2000 kg travelling at 10 m/s has a head-on collision with a sports car B of mass 500 kg. If both cars stop dead on colliding, what was the velocity of car B ?

Solution

Say, velocity of B before collision be V m/s
Initial momentum = 2000 x 10 + 500 x V   kg m/s

Final momentum = 0

As per law of conservation of linear momentum:
20000 + 500 V =0  
=> V = – 20000/500 = – 40 m/s

So the velocity of car B was 40 m/s towards A.(they had head-on collision)

Go back to the 101 problems set (class 9)

Problems Set – grade 9