part 1 of 3 A block starts at rest and slides down a frictionless track. The acceleration of gravity is 9.81 m/s2. It leaves the track horizontally, striking the ground (as shown in the figure above). 455 g 9.81 m/s2 2.4 m K - 3.8 m - a) At what height h above the ground is the block released? Answer in units of m. Answer in units of m part 2 of 3 b) What is the speed of the block when it leaves the track? Answer in units of m/s. Answer in units of m/sc) What is the speed of the block when it hits the ground? Answer in units of m/s. Answer in units of m/s