Answer:
b.positive and decreasing in magnitude.
Explanation:
The kinematics of a body can be calculated by means of the following expression.
[tex]v_{f}=v_{o}-g*t[/tex]
where:
vf = final velocity [m/s]
vo = initial velocity = 40 [m/s]
g = gravity acceleration = 9.81 [m/s²]
t = time [s]
As we can see from the above equation, the final velocity of a body decreases its initial velocity as time increases. That is, as the body rises, the velocity decreases.
