Posted by **alexia** on Friday, February 27, 2009 at 12:37pm.

no matter how many different ways i try to solve this, i cannot end up with the answer my textbook is providing me with 38m, 17m/s...

A car travelling at 40km/h accelerates at 2.3m/s^2 for 2.7s. How far has it travelled in that time? What is its final velocity?

I am supposed to use kinetic euqations for this.

- physics -
**drwls**, Friday, February 27, 2009 at 12:59pm
Perhaps your problem is with being forced to change dimensions. The initial speed of 40 km/h is 11.1 m/s

Add 2.3 m/s^2*2.7s = 6.2 m/s (rounded off) to the initial velocity, and that leads to a final velocity of 17.3 m/s. The AVERAGE velocity during the acceleration interval is 14.2 m/s. During the 2.7 s interval, it travels

14.2 m/s x 2.7 s = 38.3 m

## Answer This Question

## Related Questions

- Physics - A rocket accelerates from rest at 17 m/s2 for 11 s. How far will it ...
- Physics - A car is travelling at 2 0m/s when it pulls out to pass a truck that ...
- physics - Car A is travelling at 22.0 m/s and car B at 29.0 m/s. Car A is 300 m ...
- Science - Physics question -A driver of a car travelling at 72km/h, applying ...
- physics - A car is travelling along the road at 8m/s.IT accelerates at 1m/s for...
- physics - A car travelling along the road at 8 m/s.it accelerates at 1m/s ...
- Physics - A policeman travelling 60 km/h spots a speeder ahead , so he ...
- Physics - A policeman travelling 60 km/h spots a speeder ahead , so he ...
- Physics - A policeman travelling 60 km/h spots a speeder ahead , so he ...
- Physics - A policeman travelling 60 km/h spots a speeder ahead , so he ...

More Related Questions