An airplane pilot fell 380 m after jumping from an aircraft without his parachute opening. he landed in a snowbank, creating a crater 1.0 m deep, but survived with only minor injuries. assuming the pilot's mass was 85 kg and his terminal velocity was 50 m/s, estimate the following.
(a) the work done by the snow in bringing him to the rest

The story sure is exciting.  But when you're ready to work on answering the question, you can ignore everything before the assumptions.

-- When the pilot hit the snow, he was allegedly falling at 50 m/s.

-- His mass is 85 kg.

-- So his kinetic energy was (1/2) (mass) (speed squared) =

                                             (1/2) (85) (50)² =  106,250 joules

-- That's the energy that something else has to absorb in order to
reduce his speed to zero.

-- How far he fell, or what size crater he made in the snow, are irrelevant.