A race car (shown as a dot) is moving as shown in the one dimensional motion dia

Question

A race car (shown as a dot) is moving as shown in the one dimensional motion diagram. Throughout the period of time shown, what are the signs of position, x, and acceleration, aa?

a) x:-, a: -

b) x:-, a:+

c) x:+, a:-

d) x:+, a:+

e) None of these/Not sure

A race car (shown as a dot) is moving as shown in the one dimensional motion diagram. Throughout the period of time shown, what are the signs of position, x, and acceleration, aa?

a) x:-, a: -

b) x:-, a:+

c) x:+, a:-

d) x:+, a:+

e) None of these/Not sure

Explanation / Answer

Correct answer is a)

Explanation

Sign of x depends on position of object , from above diagram we can see that object is always to the left of x =0 i. e. In -ve

x direction so x is - .

Now direction of acceleration can be found out by looking out in which direction is velocity increasing , it can be seen that as we move towards the negative x direction the velocity is increasing so acceleration is also - .

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