A 80 kg firefighter climbs of stairs 6 meter high in ten seconds

4704 Joules

Explanation:

We are given;

Mass of the firefighter is 80 kg Height of the stairs is 6 m

Assuming we are required to calculate the work done by the firefighter;

Work done is the product of force and distance. Work done = Force * distance

We are given mass as 80 kg

But, 9.8 N = 1kg

Therefore,

Force = 80 kg * 9.8 N/kg

= 784 N

Therefore,

Work done = 784 N * 6 m

= 4704 Joules