Homework Help: physics

Posted by Kelly on Friday, December 11, 2009 at 8:15am.

Three identical balls are thrown from a cliff of height, h, above a horizontal plane. One ball is thrown at an angle of 45 degrees above the horizon, the second is thrown horizontally, and the third is thrown at an angle of 30 degrees below the horizon (so, part of this velocity is downward). If all the balls are given the same initial speed, which one will have the greatest speed at the moment just before it hits the ground?

physics - bobpursley, Friday, December 11, 2009 at 8:46am
Consider work and energy: The all have the same KE initially, they all gain from gravity the same gPE, so they all have final KE.

FinalKE=GPE+initialKE

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