A car with a mass of 40 tons moves along a straight line segment of a railroad track. Its speed before adhesion
| May 24, 2021 | education
A car with a mass of 40 tons moves along a straight line segment of a railroad track. Its speed before adhesion with a stationary car with a mass of 10 tons is 1.5 m / s. How fast will the cars move after clutching?
Data: carriage movement is linear; m1 (mass of a moving car) = 40 t (40 * 10 ^ 3 kg); m2 (mass of a stationary car) = 10 t (10 * 10 ^ 3 kg); V1 (initial speed of a moving car) = 1.5 m / s.
The speed at which the cars will move after coupling is determined by the formula (the law of conservation of momentum): m1 * V1 = (m1 + m2) * V1.2 and V1.2 = m1 * V1 / (m1 + m2).
Calculation: V1.2 = 40 * 10 ^ 3 * 1.5 / (40 * 10 ^ 3 + 10 * 10 ^ 3) = 1.2 m / s.
Answer: After coupling, the cars will move at a speed of 1.2 m / s.
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