Practice question
Question
A 9kg mass at 7m/s collides inelastically with a stationary 3kg mass. What is the final speed?
Explanation
Momentum conservation: 9×7=(9+3)vf⇒63=12vf⇒vf=5.25m/s. As per NCERT Chapter 3, equations v=u+at, s=ut+½at², v²=u²+2as describe uniformly accelerated motion. Applying correct signs and units gives 5 m/s as the result, so option A is correct.
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