Final speed after inelastic collision of 11kg and 4kg masses

Practice question

Question

A 11kg mass at 6m/s collides inelastically with a stationary 4kg mass. What is the final speed?

Options

Choose one · Correct answer highlighted

4 m/s Correct 3.20 m/s 4.80 m/s 6 m/s

Explanation

Momentum conservation: 11×6=(11+4)vf⇒66=15vf⇒vf=4.4m/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 4 m/s as the result, so option A is correct.

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