Consider the following two configurations.

a. A test charge +q is brought to a point A a distance r from the center of a sphere having net charge +Q.
b. A test charge +2 q is brought to a point D a distance 2 r from the center of the sphere. Compared with the electrostatic potential at A, the electrostatic potential at B is

a. the same
b. greater
c. smaller
Compared with the electrostatic potential energy of configuration (a), the electrostatic potential energy of configuration (b) is

a. greater
b. smaller
c. the same

Asilver dollar is dropped from the top of a building that is 1324 feet tall. use the position function below for free-falling objects. s(t) = −16t2 + v0t + s0 (a) determine the position and velocity functions for the coin. s(t) = v(t) = (b) determine the average velocity on the interval [1, 2]. ft/s (c) find the instantaneous velocities when t = 1 second and t = 2 seconds. v(1) = ft/s v(2) = ft/s (d) find the time required for the coin to reach the ground level. (round your answer to three decimal places.) t = s (e) find the velocity of the coin at impact. (round your answer to three decimal places.) ft/s