A stone of mass 500g is thrown vertically upwards with a velocity of 15 m s^-1. Calculate:
A stone of mass 500g is thrown vertically upwards with a velocity of 15 m s-1. Calculate: (a) the potential energy at the greatest height, (b) the kinetic energy on reaching the ground, (c) the total energy at its half-way point.
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(a) Potential energy at the greatest height = initial kinetic energy
or, mgh = 1/2 mv2
= 1/2 ×0.500 ×15 ×15=56.25J
(b) Kinetic energy on reaching the ground= potential energy at the greatest height = 56.25 J
(c) Total energy at its half-way point = 1/2 (K + U) = 56.25J.
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