Abag of cement originally weighing 134 lb was lifted at a constant rate. as it rose, cement also leaked out at a constant rate. by the time the bag had been lifted to 15 ft, 12 of the cement had leaked out. how much work was done lifting the cement this far? (neglect the weight of the bag and lifting equipment.)

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.