Question

An object is thrown upward with an initial velocity of 40 m/s. The velocity of the object moving upward is

a.negative and increasing in magnitude.

b.positive and decreasing in magnitude.

c.negative and decreasing in magnitude.

d.positive and increasing in magnitude.

Answer 1

b.positive and decreasing in magnitude.

Step-by-step explanation:

The kinematics of a body can be calculated by means of the following expression.

`v_(f)=v_(o)-g*t`

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.