Question

A man of 60 kg gets 1000 cal of heat by eating 5 mangoes. His efficiency is 28%. To what height he can jump by using this energy

• A. 2m
• B. 20m
• C. 28m
• D. 0.2m

Answer 1

The correct option is A 2m

Energy available with the man to jump,
= $0.28\times 1000$ = 280 cal
If the man converts this entire energy into his potential energy,
$mgh=280$
$60\times 9.8\times h=280\times 4.2$
Thus, $h=2m$