Question

Two balls moving with speed 20m/s and 10m/s on a straight road in opposite direction collide head on. If coefficient of restitution is 1/2, then relative velocity of separation between the balls will be

Answer 1

Explanation:

since e=v2-v1/u1-u2

therefore

1/2=v2-v1/20-10

therefore

v21=5ms-¹

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Answer 2

Answer:

15

Explanation:

As they are moving in opposite direction

therefore velocity of approach = v1- (-v2) = 10 + 20 = 30 m/s

Coefficient of restitution = velocity of separation/ velocity of approach

1/2 = v/30

v= 15 m/s