What is the change in the momentum of a car weighing 800 kg when its speed decreases from 72 to 36 km / h?
| August 12, 2021 | education
What is the change in the momentum of a car weighing 800 kg when its speed decreases from 72 to 36 km / h? What is the value of the force that causes the vehicle to brake if its speed has changed in 5 seconds?
Solution:
p = 800 (20-10) = 8000 kg * m / s
20 = 10 + 5a
a = 2 m / s ^ 2 F = ma = 1600 N
Answer: 7000 kg ^ m / s; 1600 N
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