Question

Вагон, масса которого равна 30 тонн, движущийся со скоростью 2 м/с, столкнулся с неподвижно стоящим вагоном. найдите массу второго вагона. действие

Answer 1

Записываем закон сохранения импульса m1v1=(m1+m2)v2 подставим 30×2=(2+m2)×1 60=2+m2 58=m2

Answer 2

Calculation of the mass of the second wagon

To find the mass of the second wagon, we can use the principle of conservation of momentum. According to this principle, the total momentum before the collision is equal to the total momentum after the collision.

The momentum of an object is calculated by multiplying its mass by its velocity. In this case, we have the following information:

- Mass of the first wagon (moving wagon): 30 tons (30,000 kg) - Velocity of the first wagon: 2 m/s - Mass of the second wagon (stationary wagon): unknown - Velocity of the second wagon (stationary wagon): 0 m/s (since it is not moving)

Using the principle of conservation of momentum, we can set up the following equation:

Momentum before collision = Momentum after collision

The momentum before the collision is given by the mass of the first wagon multiplied by its velocity:

Momentum before collision = (mass of first wagon) * (velocity of first wagon)

The momentum after the collision is given by the sum of the momenta of both wagons:

Momentum after collision = (mass of first wagon) * (velocity of first wagon) + (mass of second wagon) * (velocity of second wagon)

Since the second wagon is stationary (velocity = 0), the equation becomes:

Momentum after collision = (mass of first wagon) * (velocity of first wagon) + (mass of second wagon) * 0

Simplifying the equation, we get:

Momentum after collision = (mass of first wagon) * (velocity of first wagon)

Now we can substitute the given values into the equation and solve for the mass of the second wagon:

30,000 kg * 2 m/s = (mass of second wagon) * 0

Since anything multiplied by 0 is 0, we can conclude that the momentum after the collision is 0. Therefore, the mass of the second wagon does not affect the total momentum.

Thus, the mass of the second wagon can be any value, as long as the momentum before the collision is equal to the momentum after the collision.

Please note that the mass of the second wagon cannot be determined solely based on the given information.