Please help i don't know what to do it in introductions to physical sciences.​

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 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage

The radius of an atom is closest in size to a

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?