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The system is like seesaw ( from -20 degrees to +20 degrees at constant angular velocity for time period 't') The input angular velocity and effort end length is same while load and load distance is varied (though load * load distance is constant). I am confused by which method should I solve the problem to find required input power.

I have come up with this much of thinking:

1> Assuming radial acceleration is effective:

Power(P)

= Torque * angular velocity(omega)

= Force * force distance(r) * omega

= [m * (v^2 /r) ]* r * v/r

= m * v^3 /r

2> Neglecting radial acceleration since the horizontal component is small and the motion is not continuous circular but more like seesaw:

P = Work done / time taken

= F * d / t

= m * v/t * d/t

= m * v^2 /t

Which one should I use or if my approach has mistakes, kindly help me get through it.