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A boy of mass 40kg slides from rest down a straight slide of length 5m. The slide is inclined to the horizontal at an angle of 20°. The coefficient of friction between the boy and the slide is 0.1. By modelling the boy as a particle, find: 
a) the acceleration of the boy, 
b) the speed of the boy at the bottom of the slide.

Verified Answer :

Hopefully all of that makes sense, just comment if it doesn't. For what the question asks, the mass is irrelevant, as it cancels out, so I just left it as "m" for simplicity. "g" refers to the acceleration of freefall, I used 9.81, but you might have to do the final calculations again, depending on the level of accuracy you need. Hope this helps.

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