A block of mass m 5kg is pulled along a rough horizontal floor by a cord that exerts a constant force f of magnitude of 12N at an angle of Φ=25 degree.
a) Find normal force acting on the block by horizontal surface.
b) If coefficient of static friction between block and surface is 'u s' = 0.45. Find the minimum applied force required to accelerate the block. (Hint: Consider the static frictional force as fs,max).
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b is the right answer of the question
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