1.

A stone is thrown vertically upwards with a velocity of 40 m/s.(a) At what height will its kinetic energy and potental energy be equal ?(b) Calculate the potential energy of the body if'its mass 10 kg.10.

Answer»

v^2-u^2=2ghh=v^2-u^2/2gh=0^2-40^2/2×-10 h=-1600/-20 h=80m (a)80m/2=40m (Ans)

U=mgh =10×10×80 = 8000J (Ans)



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