Calculating Energy Required to Accelerate a Ferrari from 14km/h to 25km/h

[jeahomgrajan]

Homework Statement

If there is no friction, how much energy is needed to acccelerate a 1500kg ferrrari from 14km/h to 25km/h

Homework Equations

P=(F)(Vav)

The Attempt at a Solution

14km/h+25km/h / 2 = 19.5km/h

F=(g)(m)
F=9.8*1500
14700N

 

[Hootenanny]

Let's start from the top. Does the question say uniformally accelerated?

 

[jeahomgrajan]

NO it doesn't mention that

 

[tiny-tim]

Hi jeahomgrajan!

If there is no friction, how much energy is needed to acccelerate a 1500kg ferrrari from 14km/h to 25km/h

In other words:

What is the energy at 14km/h?
What is it at 25km/h?
What is the difference?

 

[jeahomgrajan]

thanks