Finding Momentum when giving the mass and height

  • #1
Moved from a technical forum thus no homework template.
A 50.0-kg male dancer leaps 0.32 m high.
(a) With what momentum does he reach the ground?

I know that to find momentum the equation is P = mv, but I only have the mass and distance. I have tried finding the time (D = 1/2at^2) and later used that time to find the velocity (v = d/t). I later used the velocity to complete my momentum equation, but my answer was incorrect. Can someone please help me understand this problem.
 

Answers and Replies

  • #2
kuruman
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v=d/t gives the velocity when the acceleration is zero. Here the acceleration is g.
 
  • #3
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Changing from (gravitational) PE to KE: $$mgh=½mv^2$$ from which ##v=\sqrt{2gh}##
 

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