1. The problem statement, all variables and given/known data The quality of the image is bad so heres the statement: For an interval of motion the drum of radius b turns clockwise at a constant rate ω in radians per second and causes the carriage P to move to the right as the unwound lenght of the connecting cable is shortened. Use polar coordinates r and θ and serive expressions for the velocity v and acceleration a of P in the horizontal guide in terms of the angle θ. Check your solution with time of the relation x2+h2=r2 2. Relevant equations I first found that the velocity of the carriage is v=bω/sin(θ) 3. The attempt at a solution I attempted to directly derivate the equation which give me -bωcos(θ)/sin2(θ) However, in the book answers, the answer is supposer to be b2ω2/h *cot3(θ). I think I have to do something with the vectors, like derivate v=vrer + vθeθ but I don't understand much.