1. A boy throws a ball vertically at a velocity of 4.8 ms. (a) How long is it before he catches it again?
(b) What will be the ball's greatest height above the point
of release?

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

What is the momentum of a 47-gram tennis ball that is traveling at 40 m/s

If we compare the force of gravity to strong nuclear force, we could conclude that