## Question:

A metal ball weighing 0.2 lb is dropped from rest in a fluid. If the magnitude of the resistance due to the fluid is given by ${ C }_{ d }\upsilon$ , where ${ C }_{ d }$ = 0.5 lb.s/ft is a drag coefficient and v is the ball’s speed, determine the work done by the drag force during the first 2 s of the ball’s motion.