A body of mass 55kg runs up a flight of 40 stairs, each measuring 0.15m in 15sec.Calculate the gain of potential energy by the boy.(Take g=10??) c) Show that prism can deviate a light ray through 180 degree.
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mass =55kg
hight =6m
g=10m/s^2
potential energy =mass *gravitational force *hight
potential energy =55kg*10m/s^2*6m
=3300 joule
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