The figure below shows a block with a mass of m = 5.60 kg that starts from rest at point A and slides on a track with negligible friction. Point A is at a height of h, = 7.10 m. A B 3.20 m 2.00 m (a) What is the block's speed at point B (in m/s)? m/s What is the block's speed at point C (in m/s)? m/s (b) What is the net work (in ]) done by the gravitational force on the block as it moves from point A to point C