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Question

A person of mass 42 kg eats bananas of 980 cal. If this energy is used up to lift him from the ground, the height to which he can climb is _______. [1 Cal=4.2 J].

A
10 m
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B
20 m
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C
30 m
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D
40 m
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Solution

The correct option is A 10 m
Energy of Bananas =980 cal=980×4.2 J
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
mgh=980×4.2
42×9.8×H=980×4.2 (g=9.8m/s2)
H=10 m

So,the correct option will be (A).

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