a stone is thrown upwards with a velocity of 72km/h. if air resistance is neglected find the maximum height travelled by it and the time taken for it to return to the initial position.
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the initial speed is
Vo = 72 km / h = 72 / 3.6 = 20 m / sec
if there is no friction and I consider the isolated system then the conservation of Mechanical Energy is worth
Total energy = constant = initial kinetic energy = final gravitational potential energy
1 / 2mVo ^ 2 = mgh
so I simplify m
h = Vo ^ 2/2 * g = 20 ^ 2/2 * 9.81 = 20.38 meters ( in Earth )
Explanation:
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