Question

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?

Answer 1

Original Kinetic Energy= 0 J

Final Kinetic Energy= 7500 J

Total Work Done=7500 J

Step-by-step explanation:

Kinetic Energy =
`(1)/(2) m v^(2)`

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=
`(1)/(2) 600`×
`5^(2)`= 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