What is the best description of the Pilates principle of precision?

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

Asmall object with mass 0.200 kg swings back and forth on the lower end of a light rope that is 3.00 m long. the upper end of the rope is attached to the ceiling. as the object swings through its lowest position, where the rope is vertical, the speed of the object is 5.80 m/s. at this point in the motion, what is the tension in the rope? (use g = 9.80 m/s2.)

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?