A man throwns a mass of 2Kg vertically upwords with a velocity 20 meter per second what is the potenial energy of the mass after 1 second.
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As the ball is thrown vertically upwards, v= 0m/s
u=20m/s , t= 1 sec , m=2kg , g= -10m/s
v^2 = u^2 +2as
0^2 = 20^2 + 2(-10)(s)
0= 400 + (-20s)
0 = 400 -20s
20s =400
s=400/20
=20 m
Potential energy = mgh
PE= 2 * 10 *20
= 400 kg m^2/ s^2
= 400 Joules
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