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Acceleration of a rock and a sky diver

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1. What is the acceleration of a rock at the top of its trajectory when thrown straight upward?
Explain whether or not the answer is zero by using the equation a=F/m as a guide.

2. What is the acceleration of a sky diver when air resistance is half the weight of the sky diver?

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1. As soon as the stone comes to a halt, the acceleration at the top of the trajectory is g. This is because in vertical motion, the acceleration due to gravity ...

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