B C А

A box with mass m = 2.75 kg rests on the top of a table. The coefficient of static friction between the box and the table is μs = 0.71 and the coefficient of kinetic friction is μk = 0.34. Write an expression for Fm the minimum force required to produce movement of the box on the top of the table. Solve numerically for the magnitude of the force Fm in Newtons. Write an expression for a, the box's acceleration, after it begins moving. (Assume the minimum force, Fm, continues to be applied.) Solve numerically for the acceleration, a in m/s2.

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The 150-g hockey puck initially rests on a surface at A with the spring compressed by 0.2 m, as shown. The kinetic friction coefficient between the surface and the puck is ?? = 0.1. The puck is in contact with the spring but is not attached to it. Subsequently, the spring is released. Determine the minimum stiffness of the spring so that the puck just clears the wall at B. Use any method(s) that you like