1. The problem statement, all variables and given/known data I am building a servo, to hold a golf club, and hit golf balls. My problem is, I do not know how powerful of a servo is required to swing the weight of the club/apparatus. 2. Relevant equations The arm of that holds the club, including the club, is 5 lbs. Most of the weight is within 1' of the servo shaft. The golf club + the arm is 55" long. In order for the club to move from 0 to 120 MPH within 180 degrees rotation, how powerful of a servo would I require? How much torque would be required to move that weight to accelerate the end of the club, which is 55" away, to 120 MPH? 3. The attempt at a solution I assume that the shaft would need to accelerate about 1/55 of 120 MPH, or about ~2.2 MPH. So a the servo would have to rotate the shaft about 2.2 MPH starting at 0 MPH to get to 2.2 MPH by 180 degrees, or half rotation. How much torque is required to do that? I thank you for your support and help, in advance. I am building this robot servo to hit golf balls to create a hobby my son and I can do and learn from together. he is 14. Since he is maybe going into mechanical engineering, this will give him good experience to build off.