- - A block of mass m = 9,4 kg slides on a rough surface and moves toward a spring with a spring constant k 1419 N/m, as shown in the figure below. When the block is d 21,5 m away from the spring, it has a velocity of v= 12, 3 m/s. When the block momentarily stops, it has compressed the spring by a 11 cm. What is the coefficient of kinetic friction between the block and the surface below? Provide your answer with two decimal places. Take g= 9.80 m/s. = m v d k mmmmmmmm X