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Practice question

MCQ

Question

A 2.5kg block at 7m/s encounters a force F\=−0.9xN from x\=0.4m to x\=2m. What is the final speed?

Options

Choose one · Correct answer highlighted

Explanation

Initial K=12×2.5×72=61.25J. 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 61.2 J as the result, so option A is correct.

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