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20 15 Hainan college entrance examination physics question 9 (the problem is in the picture)
You didn't use the condition of uniform descent.

Even sliding mgSinθ=umgCosθ, so Sinθ=uCosθ.

N=m(g+a)Cosθ, then the friction force f=um(g+a)Cosθ.

The downward component of force along the inclined plane F=m(g+aSinθ

Substitute F=f in the comparison, then d is correct.

Shanghai elite education, Tianshan campus physics group to answer for you.

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