# Fun Car Physics Problem. I swear it's wicked fun!

1. Aug 22, 2008

You are travelling in your 2000 kg car at 9.2 m/s and wish to accelerate to 17.5 m/s in 3.08 seconds, how much work, to the nearest joule, is required?

Okay so i don't even know hwo t ostart this problem. I know I need to find the
initial amount of work being done by the car and then subtract it from the end amount of work. Any help?

2. Aug 22, 2008

### cellotim

Give the formula for work and the formula for energy and it should be obvious.

3. Aug 22, 2008

Well the formula for work is obviously Force times Displacement and the formula for energy is 1/2 mass times the velocity squared. Do I just find the difference in thier enery?

4. Aug 22, 2008

### cellotim

Yes, the 3.08 seconds is unnecessary because we are interested in work and not power. The simplest formula for work is, $$W = \Delta E$$, i.e. change in energy.

5. Aug 22, 2008