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use the equations of motion i.e. ∑?=??, directly

Q2. An 80 kg dog is lying on the floor at rest. The coefficient of kinetic friction between the dog
and the floor is μ = 0.2. Ignore static friction. If the dog is pulled by a person with a 200 N
force as shown, determine the power supplied by the person when t = 3 s.
60⁰
P = 200 N

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