4.) A 40-kg object gains 600 joules of potential energy. What is the object's change in height? 5.) Joe uses 400 Newtons of force to raise an object to a height of 10 meters with help from a ladder. Determine the gain in potential energy of the object. 6.) Danielle throws a 7-kg shot-put straight up into the air to a height of 5 meters. a.) Determine the gain in potential energy of the shot-put. b.) As the shot-put increases its height, does the potential energy increase or decrease? c.) As the shot-put increases its height, does the speed of the shot-put increase or decrease? d.) Sketch a graph of PE vs. Height. 7.) On Planet X, a 15-kg object is raised 20 meters which gains a potential energy of 1,000 J. Determine the acceleration due to gravity on Planet X