1

### IIT-JEE 1979

Subjective
Answer the following giving reason in brief:

Is the time variation of position, shown in the figure observed in nature?

No, not possible

## Explanation

From the diagram, you can see a body is present at two different position A and B at the same time which is not possible.

2

### IIT-JEE 1979

Subjective
The dispalcement x of particle moving in one direction, under the action of a constant force is related to the time t by the equation $t = \sqrt x + 3$
where x is in meters and t in seconds. Find

(i) The displacement of the particle when its velocity is zero, and

(ii) The work done by the force in the first 6 seconds.

(i) 0
(ii) 0
3

### IIT-JEE 1978

Subjective
A car accelerates from rest at a constant rate $\alpha$ for some time after which it decelerates at a constant rate $\beta$ to come to rest. If the total time lapse is t seconds, evaluate.

(i) maximum velocity reached, and

(ii) the total distance travelled.

$(i)\,{{\alpha \beta } \over {\alpha + \beta }}t$

$(ii)\,{1 \over 2}{{\alpha \beta } \over {\alpha + \beta }}{t^2}$

On those following papers in Subjective
Number in Brackets after Paper Indicates No. of Questions
IIT-JEE 1996 (1)
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IIT-JEE 1979 (2)
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IIT-JEE 1978 (1)
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