hi, here's the Qns,(adsbygoogle = window.adsbygoogle || []).push({});

A 100-lb block of ice slides down an incline 5.0 ft and 3.0 ft high. A man pushes up on the ice parallel to the incline so that is slides down at constant speed. The coefficient of friction between the ice and the incline is 0.10. Find

(a) the force exerted by the man,

(b) the work done by the man on the block,

(c) the work done by gravity on the block,

(d) the work done by the surface of the incline on the block,

(e) the work done by the resultant force on the block, and

(f) the change in kinetic energy of the block.

I can't do Qns (a), (b)(i shall leave the rest alone for now)

What i did was to calculate frictional force 1st,

[tex]F_f = (0.1)(100) = 10 ft.lb[/tex] correct?

and then, i got stuck........ the Qns did state the angle at which the incline is tilted, so i was unable to resolve the forces(weight of ice).

Any help will be greatly appreciated. :)

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# Homework Help: Qns On Work and Energy

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