The function for the speed of a ball thrown straight up in the air is given by v(t) = 128 − 32t, where v is the ball's velocity (in feet per second) and t is the number of seconds after the ball is thrown.

What is the slope? What does it represent? (1 point)
−32; velocity decreases at rate of 32 feet per second as the time increases
32; velocity increases at rate of 32 feet per second as the time increases
−128; velocity decreases at rate of 128 feet per second as the time increases
128; velocity increases at rate of 128 feet per second as the time increases