If the impulse is 12 newton . seconds and the force is 5 newtons, how long did the force act?
1 answer:
2.4s
Explanation:
Given parameters:
Impulse = 12Ns
Force = 5N
Unknown:
Time taken for the force to act = ?
Solution:
Impulse is the change in momentum of a body when an external force acts on body for a period of time.
Impulse = force x time
Since the unknown in this problem is time, we make it the subject of the formula;
Time =
Inputting the parameters;
Time taken for force to act = = 2.4s
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Answer:
d = 44.64 m
Explanation:
Given that,
Net force acting on the car, F = -8750 N
The mass of the car, m = 1250 kg
Initial speed of the car, u = 25 m/s
Final speed, v = 0 (it stops)
The formula for the net force is :
F = ma
a is acceleration of the car
Let d be the breaking distance. It can be calculated using third equation of motion as :
So, the required distance covered by the car is 44.64 m.