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JAMB Physics 2021 Paper

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Question : 4

Total: 40

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.

0.2ms $^{-1}$
0.5ms $^{-1}$
5.0ms $^{-1}$
5.5ms $^{-1}$

Solution:

Using; m $_{1}$ u $_{1}$ + m $_{2}$ u $_{2}$ = (m $_{1}$ + m $_{2}$ )v

m $_{1}$ = 0.5kg, u $_{1}$ = 10ms $^{1}$ , m $_{2}$ = 0.5kg, u $_{1}$ = 0

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

v = 5ms $^{1}$

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