JAMB - Physics (1997 - No. 4)

An arrow of mass 0.1kg moving with a horizontal velocity of 15ms-1 is shot into a wooden block of mass 0.4kg lying at rest on a smooth horizontal surface. Their common velocity after impact is
15.0 ms-1
7.5 ms-1
3.8 ms-1
3.0 ms-1

Explanation

M1U1 + M2U2

= (m1 + m2)v

= \(\frac{(0.1 {\times} 15) + (0.4 {\times} 0)}{(0.1 + 0.4)}\)

v = 3ms-1

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