A crate on a motorized cart starts from rest and moves

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A crate on a motorized cart starts from rest and moves with a constant eastward acceleration of a = 2.80 frac{m}{s^2}. A worker assists the cart by pushing on the crate with a force that is eastward and has magnitude that depends on time according to F(t) = big(5.40 frac{N}{s}big)t. What is the instantaneous power supplied by this force at t = 5.00 s?

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