A ball has a mass of 0.046kg. (i) Calculate the change in gravitational potential energy when the ball is lifted through a vertical height of 2.05m.
Use the equation: /\GPE = m × g × /\h.

ii)The ball is released. Calculate the kinetic energy of the ball when the speed of the ball is 3.5m/s.

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.