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Given,
Angle of inclination (θ) = 45°
Coefficient of Friction (μ) = 0.3
Downward Acceleration (a) = ?
The downward force =mgSinθ
The frictional force = μR=μmgCosθ
Net downward force along the plane is,
F=mgSinθ−μmgCosθ=mg(Sin45−0.3Cos45)=mg∗0.495
Then acceleration a is given by,
F=ma ⇒ a=Fm = mg∗0.495m = 40∗0.495=4.95m/s2
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