A ball moving with velocity 2 ms^(-1) co...

A ball moving with velocity 2 `ms^(-1)` collides head on with another stationary ball of double the mass. If the coefficient of restitution is 0.5, then their velocities (in `ms^(-1)`) after collision will be

0, 2

0, 1

1, 1

1, 0.5

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