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3. Starting from rest, a 5.20-kg block slides 1.60 m down a rough 30.0° incline. The...

3. Starting from rest, a 5.20-kg block slides 1.60 m down a rough 30.0° incline. The coefficient of kinetic friction between the block and the incline is

μk = 0.436.

(a) Determine the work done by the force of gravity. J

(b) Determine the work done by the friction force between block and incline. J

(c) Determine the work done by the normal force. J

(d) Qualitatively, how would the answers change if a shorter ramp at a steeper angle were used to span the same vertical height?

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