An object of mass 100g projected vertically upwards from the ground level has a velocity of 20ms\(^{-1}\) at a height of 10m. Calculate its initial kinetic energy at the ground level.[g = 10ms\(^{-2}\), neglect air resistance]
Using, v\(^2\) = u\(^2\) - 2gx
(20)\(^2\) = u\(^2\) - 2 x 10 x 10
u\(^2\) = 400 + 200 = 600(m/s\(^2\))
initial K.E = \(\frac{1}{2}\)mu\(^2\)
= \(\frac{1}{2}\) x 0.1 x 600
= 30 J
(100g = 0.1kg)
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