<em>Power = (voltage) x (current)</em>
We don't actually know what power<em> rating</em> may be marked on the bulb or the package it comes in, but the power it actually consumes and dissipates, when connected to a 15V battery, is . . .
Power = (15 V) x (3.0 A) = <em>45 watts</em>
It is equal to the acceleration of the object.
Every body continues in a state of rest or uniform motion in a straight line unless acted on by a resultant external force. That's approximately Newton's first law of motion.
So, the velocity of something tends to remain the same, unless an external force changes it. This is sometimes called "inertia". A body at rest, as in with "no velocity" will tend to remain at rest, unless there's a force on it. inertia again.
I believe the correct answer would be "A" energy source.