A block of mass m = 5.40 kg is released from rest from point circled A and slides on the frictionless track shown in the gure below. (Assume ha 2 8.00 m.] An illustration shows a wavy track, starting from a crest, moving to a trough, then again to a crest and trough, and finally to a crest that then moves downward. Three points in the track are highlighted, A, B, and C. Point A is at the top of the track where a block of mass m is placed ready to get released. It is at the height labeled ha from the ground. Point B is shown at the next crest and is at a height of 3.20 meters from the ground. Point C is shown at the following trough and is at a height of 2.00 meters from the ground. {a} Determine the block's speed at points circled B and circled C. point circled B mfs point circled C mis {b} Determine the net work done by the gravitational force on the block as it moves from point circled Ato point circled C. J