Raindrop physics problem?

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A raindrop of mass 3.44 10-5 kg falls vertically at constant speed under the influence of gravity and air resistance. Model the drop as a particle.

(a) As it falls 150 m, what is the work done on the raindrop by the gravitational force?
____J

(b) What is the work done on the raindrop by air resistance?
____J

i already got part (a) its .05057 J, but i really need some help with part b please help me out here.
 
Since the raindrop is falling at constant speed, there is no net acceleration, so gravitational force must be equal to air resistance force, and they both operate through the same distance.

Take it from there.
 
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