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)

- Ramoshidi Physics -
**Amogelang**, Monday, October 19, 2015 at 1:33pm
A girl hold a 2kg netball at height of 1,5 m above the ground and throws is vertically upwards at a velocity of 4 m.s.it reaches its turning point and falls back to the ground

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