Question

A block of mass M = 439.0 g sits on a horizontal tabletop. The coefficients of static and kinetic friction are 0.671 and 0.441, respectively, at the contact surface between table and block. The block is pushed on with a 12.9 N external force at an angle θ with the horizontal.

a) What angle with respect to the horizontal will lead to the maximum acceleration of the block for a given pushing force?

b) What is the maximum acceleration?

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