Question

Человек массой 70 кг бежит со скоростью 3,6 км/ч. Какова кинетическая энергия этого человека?

Answer 1

Кинетическая энергия=(mv^2)/2
(70 кг × 3,6 км/ч × 3,6 км/ч)/2 = 453,6 кДж

Answer 2

Calculation of Kinetic Energy

To calculate the kinetic energy of a person, we can use the formula:

Kinetic Energy = (1/2) * mass * velocity^2

Given: - Mass of the person = 70 kg - Velocity of the person = 3.6 km/h

First, we need to convert the velocity from km/h to m/s, as the formula requires the velocity to be in meters per second.

Converting 3.6 km/h to m/s: - 1 km = 1000 m - 1 h = 3600 s

Therefore, 3.6 km/h = (3.6 * 1000) / 3600 m/s = 1 m/s.

Now, we can substitute the values into the formula to calculate the kinetic energy:

Kinetic Energy = (1/2) * 70 kg * (1 m/s)^2

Simplifying the equation: - (1/2) * 70 kg * (1 m/s)^2 = (1/2) * 70 kg * 1 m^2/s^2 = 35 kg * m^2/s^2

Therefore, the kinetic energy of the person is 35 kg * m^2/s^2.

Answer

The kinetic energy of a person with a mass of 70 kg and a velocity of 3.6 km/h is 35 kg * m^2/s^2.