Homework Help: Physics

Posted by Kim on Sunday, November 22, 2009 at 1:34pm.

a 1kg ball is thrown into the air with an initial velocity of 30 m/sec. how much kinetic energy does the ball have?

-how much potential energy does the ball have when it reaches the top of its ascent?

-how high into the air did the ball travel?

Physics - MathMate, Sunday, November 22, 2009 at 10:52pm
Assume potential energy on ground is zero.
Kinetic energy at 30 m/s
=(1/2)mv²
Potential energy at highest point, H from ground
=mgh
Equate energies,
mgh=(1/2)mv²
h=(1/2)mv²/mg
=v²/(2g)

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