(Solved): 1. As a ball falls freely (without friction) toward the ground, its total mechanical energy a) Decr ...

1. As a ball falls freely (without friction) toward the ground, its total mechanical energy a) Decreases b) Can't be determined c) Remains the same d) Increases 2. The diagram below shows three positions, A, B, and C, in the swing of a pendulum, released from rest at point $A$. [Neglect friction.] Which statement is true about this swinging pendulum? a)The potential energy at $B$ equals the potential energy at $C$. b) The speed of the pendulum at $A$ equals the speed of the pendulum at $B$. c) The potential energy at $A$ equals the kinetic energy at $B$. d) The potential energy at $A$ equals the kinetic energy at $C$. 3. A student throws a stone upward at an angle of 45 degrees. Which statement best describes the stone at the highest point that it reaches? a) Its potential energy is at a minimum. c) Its acceleration is at a maximum. b) Its kinetic energy is at a minimum. d) Its acceleration is zero. 4. A 1.0-kilogram rubber ball traveling east at 4.0 meters per second hits a wall and bounces back toward the west at 2.0 meters per second. Compared to the kinetic energy of the ball before it hits the wall, the kinetic energy of the ball after it bounces off the wall is a)one-half as great b)one-fourth as great c) four times as great d) the same 5. Which action would require no work to be done on an object? a)holding the object stationary above the ground b) pushing the object along a horizontal floor against a frictional force c)lifting the object from the floor to the ceiling d)decreasing the speed of the object until it comes to rest 6. As a spring is stretched, its elastic potential energy a) Decrease b) Can't be determined c) Increases d) Remains the same