A fast car goes from 0 m per second to 40 meters per second in 2 seconds. what is the acceleration?
2 answers:
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Answer:
D. 0.9
Explanation:
Calculating minimum coefficient of static friction, we first resolve the forces (normal and frictional) acting on the vehicle at an angle to the horizontal into their x and y components. After this, we can now substitute the values of x and y components into equation of static friction. Diagrammatic illustration is attached.
Resolving into x component:
∑
------(1)
Resolving into y component:
∑
------(2)
Static frictional force, μ
------(3)
substituting from equation (1) and
from equation (2) into equation (3)
μ
μ
μ
μ
The angle the vehicles make with the horizontal α = 42°
μ ≥ tan 42°
μ ≥ 0.9
