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Practice question

MCQ

Question

A 2kg block slides down a 37∘ incline with μk\=0.2 at constant speed. What additional horizontal force is needed to accelerate it at 1m/s2 down the plane? (Take g\=10m/s2, sin⁡37∘\=0.6, cos⁡37∘\=0.8)

Options

Choose one · Correct answer highlighted

Explanation

Constant speed: mgsin⁡θ=fk, fk=μkN, N=mgcos⁡θ. 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 2.94 N as the result, so option B is correct.

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