Question

Автомобиль массой 2500 кг едет со скоростью 144 км/ч. Чему равна кинетическая энергия автомобиля?

Answer 1

Дано
m=2500 кг
V=144 км/ч=40 м/с
Ек-?            Ек=mV²/2    Eк=2500*1600*0.5=2 000 000 =2 МДж

Answer 2

Calculating Kinetic Energy of a Car

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

Kinetic Energy (KE) = 0.5 * mass * velocity^2

Given: - Mass of the car (m) = 2500 kg - Velocity of the car (v) = 144 km/h

Calculation

First, we need to convert the velocity from km/h to m/s, as the standard unit for velocity in the kinetic energy formula is meters per second (m/s).

1. Convert the velocity from km/h to m/s: - 1 km/h = 0.277778 m/s - Velocity (v) = 144 km/h * 0.277778 m/s = 40 m/s

Now, we can use the kinetic energy formula to calculate the kinetic energy of the car.

2. Calculate the kinetic energy (KE): - KE = 0.5 * mass * velocity^2 - KE = 0.5 * 2500 kg * (40 m/s)^2 - KE = 0.5 * 2500 kg * 1600 m^2/s^2 - KE = 0.5 * 4000000 kg m^2/s^2 - KE = 2000000 J

Answer

The kinetic energy of the car is 2,000,000 joules (J).