A truck weighing 3 tons was driving at a speed of 72 km / h. After loading, its weight increased by 1 ton.
| December 29, 2020 | education
A truck weighing 3 tons was driving at a speed of 72 km / h. After loading, its weight increased by 1 ton. How many times will the momentum of a truck change if it rises at a speed of 60 km / h.
Recall the formula for finding the momentum of the body
p = m * V
Let’s convert all units to the SI system:
m1 = 3000kg
m2 = 1000kg
V1 = 72km / h = 20m / s
V2 = 60km / h = 16.7m / s
Consider the first case
p1 = 3000kg * 20 = 60,000
p2 = (m1 + m2) * V2 = 4000 * 16.7 = 66800
p2 / p1 = 66800/60000 = 1.11
Answer: momentum increased by 1.11 times
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