question_answer

A body of mass 10 kg is released from a point, where it posses an energy of 1920.8J. Find the velocity with which it hits the ground.

Answer:

\[m=10kg\] \[PE=1920.8\] \[V=?\] \[V=\sqrt{2gh}\]                              ?????..(1) \[PE=mgh\Rightarrow h=\frac{PE}{mg}=\frac{1920.8}{10\times 9.8}=19.6\] \[\Rightarrow V=\sqrt{2\times 9.8\times 19.6}=19.6\,\,m/s\]