Question

Q 1 Car A Of mass 1500kg travelling at 25 m/s collides with another car B of mass 1000kg travelling at 15m/s in the same direction.After collision the velocity of car A become 20m/s . Calculate the velocity of car B after collision

Answer 1



Rishabh asked in Science

The car A of mass 1500 kg, travelling at 25m/s collides with another car B of mass

1000kg travelling at 15 m/s on the same direction. After collision the velocity of car

A becomes 20 m/s. Calculate the velocity of car B after the collision

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Vanshika Jain answered this
16 helpful votes in Science, Class IX

Before Collision:

Car A:
m (mass) = 1500 kg
​u (initial velocity) = 25m/s

Car B:
m (mass) = 1000kg 
​u (initial velocity) = 15m/s
 
After Collision:

According to law of conservation of momentum-
Total momentum before collision = Total momentum after collision

m1u1 + m2u2 = m1v1 + m2v21500 X 25 + 1000 X 15 = 1500 X 20 + 1000 X v237,500 +  15,000 = 30,000 + 1000 X v252,500 = 30,000 + 1000 X v252,500 - 30,000 = 1000 X v222500 = 1000 X v222500 / 1000 = v222.5 = v2Therefore, the velocity after collision = 22.5 m/s