Question

Aвтомобиль массой 1,5т движется со скоростью 72 км/ч. Вычислите кинетическую энергию автомобиля .

Answer 1

Ek = m V^2 / 2

Ek = 15*10^2 * 4*10^2 / 2

Ek = 3*10^5 Дж

Answer 2

Calculation of Kinetic Energy

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

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

Given that the car has a mass of 1.5 tons (or 1500 kg) and is moving at a speed of 72 km/h, we can substitute these values into the formula to find the kinetic energy.

Mass (m) = 1500 kg Velocity (v) = 72 km/h

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

1 km/h = 0.277778 m/s

Converting the velocity:

Velocity (v) = 72 km/h * 0.277778 m/s = 20 m/s

Now, we can substitute the values into the formula:

KE = 1/2 * 1500 kg * (20 m/s)^2

Calculating the kinetic energy:

KE = 1/2 * 1500 kg * (400 m^2/s^2) = 300,000 Joules

Therefore, the kinetic energy of the car is 300,000 Joules.