A small transporting truck carrying an elephant was traveling up a hill. All of a sudden, the truck came to a stop and would not move any longer. Which of Newton’s three laws of motion explain why the truck was having difficulties carrying the elephant up the hill? A: Newton's First Law of Motion
B: Newton's Second Law of Motion
C: Newton's Third Law of Motion

Aplayground slide is 8.80 ft long and makes an angle of 25.0° with the horizontal. a 63.0-kg child, initially at the top, slides all the way down to the bottom of the slide. (a) choosing the bottom of the slide as the reference configuration, what is the system's potential energy when the child is at the top and at the bottom of the slide? what is the change in potential energy as the child slides from the top to the bottom of the slide? (include the sign of the value in your answer.)