Physics

Grade-10

Easy

Question

# There are two cars, car A and car B. Mass of car A is 3000 kg, travelling at 40 m/s collide with car B of mass 4000 kg travelling at 20 m/s in same direction. After collision, the velocity of car A becomes 50 m/s. Calculate the velocity of car B after the collision?

- 12 m/s
- 12.5 m/s
- 13 m/s
- 14 m/s

Hint:

### Use the law of conservation of momentum.

## The correct answer is: 12.5 m/s

### Given that-

Mass of car A = 3000 Kg

Speed of car A = 40 m/s

Mass of car B = 4000 Kg

Speed of the car B = 20 m/s

Final speed of car A = 50 m/s

Let the final speed of car B = v m/s

Using the law of conservation of momentum,

(3000 x 40) + (4000 x 20) = (3000 x 50) + (4000 x v)

1,20,000 + 80,000 = 150000 + 4000v

50000 = 4000 v

v = 50000/4000 = 12.5 m/s

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