A body of mass 4.2kg moving with velocity 10ms-1 due east, hits a stationary body of mass 2.8kg. If they stick together after collision and move with velocity V due east, calculate the value of V

A body of mass 4.2kg moving with velocity 10ms^-1 due east, hits a stationary body of mass 2.8kg. If they stick together after collision and move with velocity V due east, calculate the value of V

A 3ms^-1
B 6ms^-1
C 7ms^-1
D 15ms^-1
E 17ms^-1

waec 1996 physics

The correct answer is B. 6ms^-1

M₁U = (M₁ + M₂)V = 4.2 x 10 = (4.2 = 2.8)V

â´ V = 4.2 x 10/7.0 = 6m/s

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