PLEASE HELP! Ana and Fernando are playing ping pong. When Ana hits the ping pong ball with the paddle, the paddle exerts a force of 50 N on the ball. What force does the ball exert on the paddle?
A.
50 N
B.
-50 N
C.
100 N
D.
0 N

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