Two parallel plates are arranged horizontally and held at a potential difference of 10 kv, and they are separated by a distance of 7 cm. a proton enters the region halfway between the plates traveling parallel to the plates at a velocity of 3.2x107 m/s
(a)what is the electric field between these plates?
(b)what is the force this electric field places on the proton?
(c)what horizontal distance does the proton travel before striking one of the plates?

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.