Question

A boy weighing 50 kg eats bananas. The energy content of bananas is 1000 cal, if this energy is used to lift the boy from ground, then the height through which he is lifted

8.57 m
10.57 m
6.57 m
5.57 m​

Answer 1

Answer:

Explanation:8.75 is right answer

Answer 2

Answer: 8.57m

Explanation:

Mass of boy = 50kg

Energy content of banana = 1000cal

= 4.2 x 1000J

= 4200J

Energy is conserved,

→ mgh = 4200J

→ 50 • 9.8 • h = 4200

And voilà,

→ h = 8.57m.