An object of mass 2kg moving with a velocity 3ms-11 collides head-on with another object...

WAEC 2008

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 Answer: Option B

Explanation

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

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

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

= 0.67ms^-1

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An object of mass 2kg moving with a velocity 3ms-11 collides head-on with another object...

Correct Answer: Option B

Explanation

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