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You throw a rock at initial speed v0 with an upward angle theta (relative to horizontal)...

You throw a rock at initial speed v0 with an upward angle theta (relative to horizontal) off the edge of a deck of height y0 above the ground. (a) Prove that the speed of v of the rock just before it hits the ground is independent of theta. (b) If v0 = 11m/s and y0 = 13m, what is v(in m/s)?

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