Physics
posted by Kim
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?

MathMate
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) 
Amogelang
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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