11. when a ball is dropped at a certain height, its gravitational potential energy is ?
A. Increases
C. decreases
B. remains the same
D. increase and decreases
12. when a ball is dropped ata certain height, its Kinetic energy is ?
A. Increases
B. decreases
C. remains the same
D. increases and decreases
13. when a ball is dropped at a certain height, its total energy?
A. Increases
B. remains the same
C. decreases
D. increases and decreases
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11.A
12.B
13.A
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