A box is at rest on an incline plane. the coefficient of static friction is 0.3 what is the maximum angle of incline answers
Based on the equation KE = 1/2(m)(v^2), Kinetic Energy can be measured based on velocity. If an object has a large velocity, it have a larger kinetic energy than if the velocity is small.
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Answer:
(A) 3.92 m/s²
Explanation:
From friction,
F = μR .................. Equation 1
Where F = Frictional force, μ = coefficient of static friction, R = Normal reaction.
But,
R = mg and
F = ma
therefore
ma = mgμ
Where a = acceleration, g = acceleration due to gravity, m = mass of the crate.
a = gμ...................... Equation 2
Given: μ = 0.4
Constant: g = 9.8 m/s
Substitute into equation 2
a = 0.4(9.8)
a = 3.92 m/s²
Hence the right option is (A) 3.92 m/s²
Impulse = Force x Time
By substituting, Impulse = 53 x 12 = 636 N . sec
