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A 15.0-kg block rests on a horizontal table and is attached to one end of a massless, horizontal spring. By pulling horizontally on the other end of the spring, someone causes the block to accelerate uniformly and reach a speed of 5.00 m/s in 0.460 s. In the process, the spring is stretched by 0.250 m. The block is then pulled at a constant speed of 5.00 m/s, during which time the spring is stretched by only 0.0500 m.

(a) Find the spring constant of the spring.
Answer in N/m

(b) Find the coefficient of kinetic friction between the block and the table.

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