Astudent with a weight of 784 n runs up three flights of stairs in 12.0 sec. the student has gone a vertical distance of 8.0 m. how much work is done by the student to move his body to this height? assume that his speed is constant.
a) 98j
b) 1176j
c) 6272j
d) 61466j

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.