A person of mass 42kg eats bananas of 980cal. If this energy is used up to lift him from the ground, the height to which he can climb is _______. [1Cal=4.2J].
A
10m
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B
20m
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C
30m
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D
40m
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Solution
The correct option is A10m Energy of Bananas =980cal=980×4.2J
Energy required to climb =mgH
where, H= Height from the ground
g= Acceleration due to gravity
m= Mass of the person
Since, this energy is used up to lift him from the ground