A boyweighing 42 kg eats bananas whose energy is 980 calories. If this energy is used to go toheight h find the vlaue of h (J = 4.2 J/calorie)

A boyweighing 42 kg eats bananas whose energy is 980 calories. If this

1.	A boyweighing 42 kg eats bananas whose energy is 980 calories. If this energy is used to go toheight h find the vlaue of h (J = 4.2 J/calorie)
Answer» SOLUTION :ENERGY GAINED by the BOY in eating bananas `=980" calories " =980xx4.2J`. If m is the mass of the boy, the potential energy gained by the boy in going up THORUGH a height h is mgh. In SI, energy = potential energy `rArr 980 xx 4.2=` mgh `980 xx 4.2 = 4.2 xx 9.8 xx h rArrh = (980 xx4.2)/(42xx9.8) = 10m`