A car with a mass of 30,000 kg moving at a speed of 1.5 m / s is automatically coupled on the move
| September 12, 2021 | education
A car with a mass of 30,000 kg moving at a speed of 1.5 m / s is automatically coupled on the move with a stationary car of the same mass. How fast is the hitch moving?
To calculate the speed of the specified coupling from identical cars, we will use the law of conservation of momentum: mv1 * Vv1 = (mv1 + mv2) * V = 2mv1 * V, whence we express: V = mv1 * Vv1 / 2mv1 = Vv1 / 2.
Variables: Vv1 – initial speed of the first car (Vv1 = 1.5 m / s).
Calculation: V = Vv1 / 2 = 1.5 / 2 = 0.75 m / s.
Answer: The specified coupling of identical cars will move at a speed of 0.75 m / s.
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