two children pull on a sled in opposite directions, each pulling with a force of 11 N. a) What is the net force acting on the sled? c) What is the acceleration of the sled? d) What is the velocity of the sled? show work.

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants

The ability to make things happen is also called a. heat b. force c. matter d. energy

How long will it take a car traveling of a constant speed of 45m/s to cover the distance of a 2.5km?