21.At the airport, a person pushes a luggage cart with an applied force of 150 N [forward]. Assuming the cart and luggage have a total mass of 46.0 kg and the force of friction is 95.0 N [backward], the magnitude of the acceleration of the luggage is _____ m/s2.
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a = Fap-Fk)/M = (150-95)/46 = 1.20 m/s^2
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