# A question in knematics

1. Jun 4, 2014

### ritik.dutta3

1. The problem statement, all variables and given/known data

A particle moves along a straight line such that its displacement x changes with time t as x= sqrt( at+2bt + c) where a, b and c are constants, then the acceleration varies with x as

2. Relevant equations

3. The attempt at a solution
I cant figure out how do i solve it. Using graphs as well, I could not arrive at any conclusion.

2. Jun 4, 2014

The question is incomplete. Please post the full question

3. Jun 4, 2014

### ritik.dutta3

No, @adjacent, the question isnt incomplete. We have to fill in the blank. "the acceleration varies with x as ________ ". Sorry for not mentioning it clearly!

4. Jun 4, 2014

When you are given the position as a function of time, how do you find the acceleration using derivative?

5. Jun 4, 2014

### cosmosmike

My suggestion:
First take second derivative of x with respect to t to get acceleration which we will call z.
Then use dz/dx = (dz/dt)/(dx/dt)

Looks messy, but technically correct. In the final result, substitute for x where it appears.