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A ball of mass 0.5kg moving at 10ms1 collides wit...

A ball of mass 0.5kg moving at 10ms1 collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.

A.

0.2ms1

B.

0.5ms1

C.

5.0ms1

D.

5.5ms1

Correct answer is C

Using; m1 u1 + m2 u2 = (m1 + m2)v

m1 = 0.5kg, u1 = 10ms1, m2 = 0.5kg, u1 = 0

(0.5kg x 10) + (0.5 x 0) = (0.5 + 0.5)v

v = 5ms^{1}