Physics

Grade-10

Easy

Question

# There are two cars, car A and car B. Mass of car A is 3000 kg, travelling at 30 m/s collide with car B of mass 2000 kg travelling at 10 m/s in same direction. After collision, the velocity of car A becomes 60 m/s. Calculate the velocity of car B after the collision?

- – 35 m/s
- – 20 m/s
- 35 m/s
- 20 m/s

Hint:

### Use law of conservation of momentum to find final velocity of car B after collision.

## The correct answer is: – 35 m/s

### Given that-

Mass of car A = 3000 Kg

Speed of the car A = 30 m/s

Mass of car B = 2000 Kg

Speed of car B = 10 m/s

Final speed of car A = 60 m/s

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

Using the law of conservation of momentum,

(3000 x 30) + (2000 x 10) = (3000 x 60) + (2000 x v)

90,000 + 20,000 = 180000 + 2000v

-70,000 = 2000 v

v = -70000/2000 = -35 m/s

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