A man of 60kg gains 1000 cal of heat by eating 5 mangoes and his efficiency is 56%. The height to which he can jump by using this energy is ______m . (approximately).

[Round-off to the nearest integer]

$w=JH(H=amountofheat)$

$\begin{array}{l}efficiency=\frac{output}{input}\\ 56\%=\frac{output}{1000\times 4.186}\\ \frac{56}{100}\times 1000\times 4.186=output\\ output=2344\end{array}$

While jumping in reaching maximum height. This energy gets converted into gravitational potential energy.

$\begin{array}{l}\Rightarrow 2344=mgh\\ h=\frac{2344}{mg}=\frac{2344}{60\times 9.8}=3.98\approx 4\left(approx\right)\end{array}$