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.


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