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c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

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