Solution to problems – class 9 – Set 1 Q 56

Problem Statement

56)A truck of mass 500 kg moving at 4 m/s collides with another truck of mass 1500 kg moving in the same direction at 2 m/s.

What is their common velocity just after the collision if they move off together?

Solution

Total initial momentum = 500 x 4 + 1500 x 2 = 5000 kg m/s

Now after collision as they combine, their net mass is =500 +1500 =2000 kg
Let the common velocity is V
So final momentum is 2000V


As per law of conservation of momentum

2000 V =  5000
So V = 5000/2000 m/s = 2.5 m/s

Question Set – Physics Problems for grade 9

Solution to problems – class 9 – Set 1 Q 56
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