What is the force of a dodgeball hitting a person in the face if it's initial velocity was 10m/s and it's velocity after hitting him in the face it is 5m/s? The ball weighs 3kg and it took 2 seconds to get there. p/t p=momentum t=time

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c