Calculaily nec reryy and work
a 600 kg car is at rest, and then accelerates to 5 m/s.
what is its original kinetic energy?
what is its final kinetic energy?
how much work was used?

Original Kinetic Energy= 0 J

Final Kinetic Energy= 7500 J

Total Work Done=7500 J

Explanation:

Kinetic Energy =

where, m= mass of the body/car

            v= velocity of the car

Initially car is at rest, so v=0.

Original Kinetic Energy= 0 J

After being accelerated to a velocity of 5m/s Kinetic Energy= ×= 7500 J

Final Kinetic Energy= 7500 J

Total Work Done on the Car = Final Kinetic Energy- Initial Kinetic Energy

This is assuming that the car accelerates under ideal circumstances ie. under no friction or resistance of any kind.

Total Work Done=7500 J

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.