Acar initially at rest accelerates in a straight line at 18 m/2^2. what will be its speed after 12 seconds?

Acceleration by definition is the time rate change of velocity.(velocity and speed are the same in unidirectional motion)

When you say that your acceleration is 18m/s^2 what you're saying is that there is a change of 18m/s in velocity, every second.

Since your acceleration or 'change' is positive, you know that the velocity is increasing.

The net change in velocity over 12 seconds is = 12 x 18 = 216 m/s

Since the body mentioned in the question was initially at rest, this is also the final velocity of the body.

This is what i found on google “kinetic energy. energy is transferred from one object to another when a reaction takes place. energy comes in many forms and can be transferred from one object to another as heat, light, or motion, to name a few. this energy would be in the form of motion, with the person lifting the blue ball to a higher level.” i hope this you

Ithink your answer is d