Homework Help: physics

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

Physics - A car accelerates at a constant rate from zero to 25.6 m/s in 10 ...
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, Please help!!! - A car accelerates at a constant rate from zero to 32.6...
Physics - A car reaches a speed of 40m/s from rest in a time of 8 seconds. After...
Physics - A sports car moving at constant speed travels 150 meters in 5.4 ...
Physics - A car of mass 1200kg starts from rest, accelerates uniformly to a ...
physics - A particle travels along a straight line with a speed = (0.50 -7 ), ...
Math-acceleration - An object moves across a straight line so that after t ...
Physics - Consider an object on a straight-line path undergoing constant ...

For Further Reading

First Name:
School Subject:
Answer: