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Q. A 0.15kg baseball is thrown upward with an initial speed of 20.0 m/s. What os thhe force on the ball when it reaches half of its maximum height?

Q. Solar energy is incident on the pond at an average rate of 400 . If the water absorbs all the solar energy and does not exchange energy with its surroundings, how many hours will it take to warm from 15 to 25 ?

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