Drag question

1. The problem statement, all variables and given/known data

At international cricket games, it is commonplace to display on the scoreboard a speed for each bowl. Because the ball is subject to a drag force due to air proportional to the square of its speed given by R = kmv^2, it slows as it travels 20 m toward the wicket according to the formula v = vie^(−kx). Suppose the ball leaves the bowler’s hand at 151 km/h. Ignore its vertical acceleration, and determine the speed of the ball when it hits the wicket. (For a cricket ball, assume the mass is 0.16 kg, the radius is 3.5 cm, and the terminal velocity is 40 m/s. The density of air is 1.2 kg/m3.)

2. Relevant equations

Apart from the equations i have tried R=0.5DpAv^2
but i don’t know the drag coefficient!

3. The attempt at a solution
Honestly i don’t know where to start, i have tried googling a similar question also.
The problem is I cannot figure out R. If i knew drag coefficient i could work out k, then work out v over the distance

http://ift.tt/1puvPed

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