**14. A 15.0-kg block rests on a horizontal table and is attached to one endof a massless, horizontal spring. By pulling horizontally on the other endof the spring, someone causes the block to accelerate uniformly and reacha speed of 5.00 m/s in 0.500 s. In the process, the spring is stretched by0.200 m. The block is then pulled at a constant speed of 5.00 m/s, duringwhich time the spring is stretched by only 0.0500 m. Find (a) the springconstant of the spring and (b) the coeffi cient of kinetic friction betweenthe block and the table.

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**14. 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 0.500 s. In the process, the spring is stretched by0.200 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. Find (a) the spring
constant of the spring and (b) the coeffi cient of kinetic friction between
the block and the table.

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