in the figure, the sliding block has a mass of 0.850 kg, the counterweight has a mass of 0.420 kg, and the pulley is a uniform solid cylinder with a mass of 0.350 kg and an outer radius of 0.0300 m. the coefficient of kinetic friction between the block and the horizontal surface is 0.250. the pulley turns without friction on its axle. the light cord does not stretch and does not slip on the pulley. the block has a velocity of 0.820 m/s toward the pulley when it passes through a photogate. (a) use energy methods to predict the speed of the block after it has moved to a second photogate 0.700 m away. (b) find the angular speed of the pulley at the same moment.