1. The movement of jet aircraft is explained by _______.
A. Newton’s 1st law
B. Newton’s 2nd law
C. Newton’s 3rd law
D. Newton’s gravitation law

2. Maria is playing jump rope. which of the following shows the greatest amount of potential energy?
A. At the middle of a jump
B. At the bottom when he bends her knees
C. At the bottom when she hit the ground
D. At the top right before she go down again

3. if a red book is placed higher than a blue book and both books have the same mass. which has more potential energy?
A. Red book
B. Blue book
C. They both have same potential energy.
D. Can’t tell because of lacking information given