Physics skydiver with proportionality and magnitude?

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Its been about 12 years since I have taken a math class. I'm currently taking a Physics class for a requirement. I'm pretty good with newtonian laws however I have no clue how to solve for the below problem. I need to know what equations and how they plug in on this issue. Our professor never went over this in lecture and in the current chapter it doesnt cover this.

A 64.1-kg skydiver reaches a terminal speed of 51.4 m/s with her parachute undeployed. Suppose the drag force acting on her is proportional to the speed squared, or Fdrag = kv2.

(a) What is the constant of proportionality k? (Assume the gravitational acceleration is 9.8 m/s2.)

(b) What was the magnitude of the acceleration when she was falling at half terminal speed?
 
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