While running, a person dissipates about 0.60 j of mechanical energy per step per kilogram of body mass. if a 51-kg person develops a power of 67 w during a race, how fast is the person running? (assume a running step is 1.5 m

The speed of the person is 3.27 m/s.

Explanation:

Given that,

Mass of runner = 51 kg

Power = 67 W

Energy = 0.60 J

1 step = 1.5 m

We need to calculate the dissipates energy for 51 kg runner

We need to calculate the total energy

Using formula of total energy

The power is,

Put the value of

Multiply each side by

Put the value into the formula

We need to calculate the speed of the person

Using formula of speed

Here,

Where, d = distance

t = time

Put the value into the formula

Hence, The speed of the person is 3.27 m/s.

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.

we need to know the time interval during which the force acts. impulse of force = momentum change