A boy weighing $40\ kg$ makes a high jump of $1.5\ m$. (i) What is his kinetic energy at the highest point? (ii) What is his potential energy at the highest point? $(g=10\ m/s^2)$.

(i). At the highest point, the kinetic energy of the boy will be zero as his velocity becomes zero at the highest point.

(ii). As given, mass of the boy $m=40\ kg$

Height $h=1.5\ m$

Acceleration due to gravity $g=10\ m/s^2$

Potential energy of the boy at highest point $P=mgh$

$=40\times1.5\times10$

$=600\ Joule$

Thus, the potential energy of the boy is $600\ Joule$ at the highest point.

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Updated on: 10-Oct-2022

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