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1. |
A ball is projected into the air with 100 J of kinetic energy which is transformed to gravitational potential energy at the top of its trajectory. When it returns to its original level after encountering air resistance, its kinetic energy is ? |
A. | less than 100 J |
B. | more than 100 J. |
C. | 100 J |
D. | not enough information given |
Answer» B. more than 100 J. | |