Question

a man drops a stone of2000g from the height of 5m what is its kinetic energy when it reaches the ground

Answer 1

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$as \: total \: energy \: remains \: constant \: \\ throughout \: the \: free \: fall \\ energy \: at \: the \: top \: is \: totally \: potential \: in \: nature \\ and \\ energy \: at \: the \: bottom \: is \: totally \: kinetic \: in \: nature \\ \color{purple}{kinetic \: energy \: when \: the \: stone \: reaches \: the \: ground :} \\ \color{maroon}{kinetic \: energy = mgh } \\ \color{red}{ = \frac{2000}{1000} \times 10 \times 5 } \\ \color{red}{ =100 \: joule }$

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