- A block of mass m = 9,3 kg slides on a rough surface and moves toward a spring with a spring constant k = 1160 N/m, as shown in the figure below. When the block is d 19,4 m away from the spring, it has a velocity of u. At the instant the block momentarily stops, it has compressed the spring by x = 29 cm. If the coefficient of kinetic friction between the block and the surface below is = 0,35, what is the block's velocity, u ? Provide your answer in units of m/s using one decimal place. Take g = 9.80 m/s. m V d k o o o o o o o o o o X