When forming a train with a stationary car, the mass of which is 50 tons, a car with a mass of 25 tons collides.
| September 15, 2021 | education
When forming a train with a stationary car, the mass of which is 50 tons, a car with a mass of 25 tons collides. After automatic coupling, both cars move at a speed of 1m / s. what speed the moving car had before the coupler.
Initial data: m1 (mass of a stationary car) = 50 t; m2 (mass of a moving car) = 25 t; V1.2 (speed of two cars after automatic coupling) = 1 m / s.
The speed that the moving car had before the automatic coupling is determined using the law of conservation of momentum: m2 * V2 = (m1 + m2) * V1.2, whence V2 = (m1 + m2) * V1.2 / m2.
Calculation: V2 = (50 + 25) * 1/25 = 3 m / s.
Answer: Before the automatic coupling, the moving car had a speed of 3 m / s.
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