# Physics

posted by .

The mass of a car is 2400 kg. the constant power supplied by the engine is 60 kW and the car starts from rest. What is the speed of the car at the end of 2 seconds?

• Physics -

derp 10 m/s

• Physics -

17m/s

• Physics -

We know the power (6x10^4 Watts), and that power equals work over time. If you solve for the work, you get 1.2x10^5 Joules. Work is a form of energy, and if you set the initial kenetic energy (0 joules) plus the work done by the engine equal to the final kenetic energy you can solve for the final velocity.

## Similar Questions

1. ### Physics

A car with a mass of 1500kg starts from rest and accelerates to a speed of 18m/s in 12s. Assume that the force of resistance remains constant at 400N during this time. What is the average power developed by the car's engine?
2. ### physics

a car of mass 'm'starts from rest and is driven with constant power.after some time it covers a distance 'x'.what should be the speed of car?

A 2300. kg car starts from rest and accelerates uniformly to 24.0 m/s in 24.0 s. Assume that air resistance remains constant at 510 N during this time. Find (a) the net force on the car b) the average power developed by the engine?
4. ### Physics!!!

A 2300. kg car starts from rest and accelerates uniformly to 24.0 m/s in 24.0 s. Assume that air resistance remains constant at 510 N during this time. Find (a) the net force on the car b) the average power developed by the engine?

A 2300. kg car starts from rest and accelerates uniformly to 24.0 m/s in 24.0 s. Assume that air resistance remains constant at 510 N during this time. Find (a) the net force on the car b) the average power developed by the engine?
6. ### Physics

A car of mass 1200kg starts from rest, accelerates uniformly to a speed of 4.0 meters per second in 2.0 seconds and continues moving at this constant speed in a horizontal straight line for an additional 10 seconds. the brakes are …
7. ### Physics

The speed time graph shows the motion of a car over a period of 40 seconds. a. describe the motion of the car between: 1.) O and A - The car is traveling at constant speed from 0 to 20 m/s. 2.) A and B - The car is at rest for 20 seconds. …
8. ### Physics

The speed time graph shows the motion of a car over a period of 40 seconds. a. describe the motion of the car between: 1.) O and A - The car is traveling at constant speed from 0 to 20 m/s. 2.) A and B - The car is at rest for 20 seconds. …
9. ### physics

Car a starts from rest and speeds up with constant accelleration until it reaches its max speed. Car b starts from rest, at the moment car a is at max speed, and speeds up with constant acceleration. How much time elapses between when …
10. ### AP Physics

A car with a mass of 1200 kg kg starts from rest and accelerates to a speed of 12 m/s in 12.2 s. Assume that the force of resistance remains constant at 328 N during this time. What is the average power developed by the carâ€™s engine?

More Similar Questions