A body moving in a straight line with constant accelaration

[VICKZZA]

Homework Statement

A body moving in a straight line with constant accelaration takes 3 seconds and 5 seconds to cover two successive distances of 1m.Find the accelaration?

Homework Equations

The Attempt at a Solution

 

[TaxOnFear]

Constant Acceleration. Hint is in the question.

 

[VICKZZA]

i didnt get u

 

[TaxOnFear]

Hmm, seems impossible without more information (i.e. initial or final velocity). Did you copy the question down properly?

 

[VICKZZA]

question is right

 

[HallsofIvy]

It looks straight forward to me. Take the initial speed to be v and acceleration to be a. Take t= 0 at the beginning of the first second in which the object goes 3 feet.

The distance such an object covers is t seconds is $vt+ (1/2)at^2$. In one second, it will have gone distance v+ (1/2)a. In two seconds it will have gone distance 2v+ 2a. What distance did it go the second second? Set those equal to 3 and 5 and you have two equations to solve for v and a.

 

[TaxOnFear]

It looks straight forward to me. Take the initial speed to be v and acceleration to be a. Take t= 0 at the beginning of the first second in which the object goes 3 feet.

The distance such an object covers is t seconds is $vt+ (1/2)at^2$. In one second, it will have gone distance v+ (1/2)a. In two seconds it will have gone distance 2v+ 2a. What distance did it go the second second? Set those equal to 3 and 5 and you have two equations to solve for v and a.

So simple, nice one.