Find the force necessary to pull a 6 kg object 3 m/s2

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

What’s #16 asking me and how do i solve it?