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An object of mass 2kg moving with a velocity 3m... - WAEC Physics 2008 Question

An object of mass 2kg moving with a velocity 3ms-11 collides head-on with another object of mass 1kg moving in the opposite direction with a velocity of 4ms-1. If the objects stick together after collision, calculate their common speed.

A
0.60ms-1
B
0.67ms-1
C
2.00ms-1
D
3.33-1
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Correct Option: B

(M_1V_1 - (M_2V_2) = V(M_1 + M_2))

2 x 3 - 1 x 4 = V(2 + 1)

V = (\frac{2}{3})

= 0.67ms-1

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