A car with a mass of 2 tons, moving in a straight line, increased its speed from 36 km
| September 8, 2021 | education
A car with a mass of 2 tons, moving in a straight line, increased its speed from 36 km / h to 20 km / s. find the change in momentum of the car.
m = 2 t = 2000 kg.
V1 = 36 km / h = 10 m / s.
V2 = 20 km / s = 20,000 m / s.
Δp -?
The momentum of the body p is a vector physical quantity equal to the product of the body’s mass m by its velocity V: p = m * V. The momentum of the body is directed in the same way as the speed of movement of the body.
The change in impulse Δp is expressed by the formula: Δp = р2 – р1 = m * V2 – m * V1 = m * ΔV.
Δp = 2000 kg * (20,000 m / s – 10 m / s) = 39980000 kg * m / s.
Answer: when driving, the momentum of the car increased by the value Δp = 39980000 kg * m / s.
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