Calculating acc. from the given data

[jatin1990]

Homework Statement

A car moving with uniform acceleration covers 450m in a 5 second interval, and covers 700m in the next 5 seconds interval. The acceleration of the car is ?

Homework Equations

The Attempt at a Solution

please correct me if i am wrong, i calculate velocity at the end of the first run i.e. v1= 450/5= 90m/s . And then at the end of 2nd run v2= 700/5 = 140 m/s. Then i apply,
Acceleration =change in velocity upon time period i.e. (140-90)/5 = 10m/s^2 , right?
Thank you.

 

[tiny-tim]

hi jatin1990!

please correct me if i am wrong, i calculate velocity at the end of the first run i.e. v1= 450/5= 90m/s . And then at the end of 2nd run v2= 700/5 = 140 m/s.

nooo, that gives you the average velocity, which doesn't help much

you'll probably need two constant acceleration equations, one for each time period

(you may find it easier to put t = 0 in the middle, so that the two end-times are ±5 s )