A ball has 17J of kinetic energy and its mechanical energy is 25J. a.) Find the gravitational potential energy of the ball? b.) lf the ball has a mass of 3.2 kg & what is lts height above the ground?  c.) What is the speed of the ball?

A 1-kg book is thrown from a height of 5 meters with a speed of 20 m/s. Compute the total energy when it reaches the ground.   a. 100 J b. 150 J c. 200 J d. 250 J

2. You throw a 3 kg ball upwards: it goes up, turns around, and falls back down. At some point during its flight, it has a height of 2 meters, and a speed of 6 m/s. a. Calculate the total energy of the ball For each of the following heights in its flight, calculate the ball's gravitational energy, total energy, and its kinetic energy. Assume total energy is conserved for the ball. (Hint: you will need to use the total energy to figure out the kinetic energy) b. Height = 3 meters C. Height =1 meters d. Height =0 meters

A sled of 150 kg mass moves along a smooth horizontal surface at 7 m/s. The sled encounters a rough spot that exerts a force of -90 Nt on the sled.  Calculate: a) What is the acceleration of the sled? b) Calculate how much work is done by the frictional force on the sled if the patch is 15 m in length. c) What is the sled's final velocity as it leaves the rough spot?