2. A helicopter lifts an astronaut in the vertical direction with a rope. The acceleration of the astronaut is 0.98m/s 9-. The astronaut is lifted up a distance of 15m and is 72kg. A} How much work is done by the force rope pulling up the astronaut? b) What is the work done by the force due to gravity? c} What is the kinetic energy of the astronaut at the top? d) What is the speed of the astronaut at the top