1. The problem statement, all variables and given/known data An object moves so it's coordinates at the time t is given by the relationships x = 25t y = 20t-5t^2 What is the object's speed and direction at 3 sec? t = 3 sec 2. Relevant equations v = √(dy/dt)^2 / (dx/dt)^2 Pythagoras theorem 3. The attempt at a solution dx=25 dy=20-10t I'm not sure how I should use this by combining the two formulas above.