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Q. A 0.113 kg ball is thrown straight up from 1.94 m above the ground. Its initial vertical speed is 5.20 m/s. A short time later, it hits the ground. Calculate the total work done by the force of gravity during that time.

Q. A bat flying in a cave emits a sound pulse and receives its echo in 3.5 s. How far away is the cave wall?

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