# Physics (Help!)

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You throw a glove straight upward to celebrate a victory. Its initial kinetic energy is K and it reaches a maximum height H. What is the kinetic energy of the glove when it is at the height H/2?

• Physics (Help!) -

If the PE is half, the KE must have lost half.

• Physics (Help!) -

Can you please explain it a little more. I still don't understand it.

• Physics (Help!) -

KE+PE=a constant
first find the constant. AT the beginning, PE is zero, and KE is K

KE+PE=K

when at half height, PE=1/2 K
KE+1/2 K=K
KE=1/2K

• Physics (Help!) -

Ok thanks. Can 1/2K also be written as K/2?

• Physics (Help!) -

yes

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