Which statements correctly compare the gravitational force with the electrical force?

a. the gravitational force can be repulsive.
b. the gravitational force can be attractive.
c. the electrical force can be repulsive.
d. the electrical force can be attractive.
e. any two objects experience a gravitational force between them.
f. any two objects experience an electrical force between them.

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