Posted by **Ankur** on Sunday, March 7, 2010 at 9:18pm.

an object travels in a straight line at a constant acceleration for 6 seconds.in the first 2 seconds it travels 18 metres and in entire 6 seconds it covers 102 metres. find the acceleration.

- physics -
**bobpursley**, Sunday, March 7, 2010 at 9:22pm
102=vi(6)+1/2 a 36

18=vi(2)+ 1/2 a 4

multiply the second equation by 3, then subtract the second equation from the first.

- physics -
**Damon**, Sunday, March 7, 2010 at 9:24pm
d = Vi t + (1/2) a t^2

18 = Vi (2) + (1/2) a (4)

102 = Vi (6) + (1/2) a (36)

18 = 2 Vi + 2 a

or

9 = Vi + a

102 = 6 Vi + 18 a

or

17 = Vi + 3 a

8 = 2 a

a = 4 m/s^2

and

Vi = 5 m/s

- physics -
**Ankur**, Sunday, March 7, 2010 at 9:44pm
thnx guyz !!!!!!!!

## Answer this Question

## Related Questions

- Maths - the distance, s metres, traveled by a car in t seconds after the brakes ...
- Calculus - A particle moves on a vertical line. Its position, s, in metres at t ...
- physics - A car accelerates at a constant rate from zero to 25.9 m/s in 7.6 ...
- Physics - A car accelerates at a constant rate from zero to 36.8 m/s in 10 ...
- physics help! - A car accelerates at a constant rate from zero to 32.6 m/s in 10...
- Physics - A sports car moving at constant speed travels 150 meters in 5.4 ...
- Physics, Please help!!! - A car accelerates at a constant rate from zero to 32.6...
- Physics - A car accelerates at a constant rate from zero to 25.6 m/s in 10 ...
- physics - a car moving with constant acceleration covered a distance of 50 ...
- Physics - A car reaches a speed of 40m/s from rest in a time of 8 seconds. After...