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To test the ability of a handmade rock launcher, it is set up vertically. It is recorded that a rock flies for 3.6 seconds before

To test the ability of a handmade rock launcher, it is set up vertically. It is recorded that a rock flies for 3.6 seconds before it is returned to the ground.

a) Find the vertical velocity at which it leaves the ground.

b) Calculate the maximum height the rock has reached.

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