While running, a person dissipates about 0.6 J of mechanical energy per step per kilogram of body mass. If a 60-kg person runs with a power of 70 Watts during a race, how fast is the person running

Complete question is: While running, a person dissipates about 0.60 J of mechanical energy per step per kilogram of body mass. If a 60-kg person develops a power of 70 W during a race, how fast is the person running? (Assume a running step is 1.5 m long).

The person running at a speed of 2.91 m/s.

Explanation:

Given: Mass of runner = 60 kg

Runner dissipates = 0.6 J/kg per step

Average power = 70 W

1 step = 1.50 m

Energy dissipated by the runner is as follows.

Formula used to calculate the value of one step 'S' is as follows.

It is known that average velocity is equal to the total distance divided by time interval.

So, total distance for the given situation is as follows.

Hence, speed of the person is calculated as follows.

Thus, we can conclude that the person running at a speed of 2.91 m/s.

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