A ball of mass 0.5kg moving at 10ms-1 collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.

A ball of mass 0.5kg moving at 10ms^-1 collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.

A 0.2ms^-1
B 0.5ms^-1
C 5.0ms^-1
D 10.0ms^-1
E 20.0ms^-1

waec 1988 physics

The correct answer is C. 5.0ms^-1

No explanation given

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