93. (a) The component of the weight along the incline (with downhill understood as the positive direction) is mgsinθwhere m= 630 kg and = 10.2°. With f= 62.0 N, Newton’s second law leads to mgfmasin−=which yields a= 1.64 m/s2. Using Eq. 2-15, we have 80 06 201
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