# Another one

1. Dec 22, 2007

### rr92890

A dragster and a driver together have mas 930.1 kg. the dragster, starting from rest, attains a speed of 25.8 m/s in .56 s. Find the average accel. of the dragster during ths time interval. What is the size of the average force on the dragster during this time interval? Answer in units of N.
The driver has a mass of 74.9 kg. What horizontal force does the seat exert on the driver.

I'm not even sure where to start.

2. Dec 22, 2007

### rock.freak667

Do you know what acceleration is? Do you know a formula for it? Do you know newton's 2nd law?

3. Dec 23, 2007

### rr92890

would it be 25.8m/s / .56s (46.07142857) for the acceleration. and I now that the second law is Fnet=Ma...OO, so it is 46.07142857*930.1=42851.03571 N?

4. Dec 24, 2007

### Von

not *930.1 , *74.9.
Because you're talking about the force exerting on the driver,not both of them.

5. Dec 24, 2007

### Hootenanny

Staff Emeritus
Erm...

6. Dec 24, 2007

### Shooting Star

?

(I wanted to post just the '?', but evidently it found the post too short and didn't accept! But Hootenanny's post is considered to be a complete thesis?

7. Dec 24, 2007

### Shooting Star

He also has to find the force on just the dragster. So, *(930.1 - 74.9).

Do you understand the Erm... now?

Last edited: Dec 24, 2007
8. Dec 24, 2007

### Von

Didn't see that! o(∩_∩)o...