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Motion in A Straight Line question

2021 · 16 Mar · Shift 1 · Q45
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  5. /2021 · 16 Mar · Shift 1 · Q45

Motion in A Straight Line question

2021 · 16 Mar · Shift 1 · Q45

JEE MainPhysicsMotion in A Straight LineMCQ+4 / −1
The velocity-displacement graph describing the motion of bicycle is shown in the figure. JEE Main 2021 (Online) 16th March Morning Shift Physics - Motion in a Straight Line Question 75 English The acceleration-displacement graph of the bicycle's motion is best described by :
  1. A
    JEE Main 2021 (Online) 16th March Morning Shift Physics - Motion in a Straight Line Question 75 English Option 1
  2. B
    JEE Main 2021 (Online) 16th March Morning Shift Physics - Motion in a Straight Line Question 75 English Option 2
  3. C
    JEE Main 2021 (Online) 16th March Morning Shift Physics - Motion in a Straight Line Question 75 English Option 3
  4. D
    JEE Main 2021 (Online) 16th March Morning Shift Physics - Motion in a Straight Line Question 75 English Option 4
View written solutionFree

Correct answer: A

The question refers to a velocity–displacement graph and asks for the corresponding acceleration–displacement graph, but the actual figure and the option graphs are not provided in the prompt.

So, the exact graph cannot be derived uniquely from the text alone. However, the required relation between acceleration, velocity, and displacement is:

1. Key relation

For motion in a straight line,

a=dvdt a = \frac{dv}{dt}a=dtdv​

and since

v=dxdt, v = \frac{dx}{dt},v=dtdx​,

we can write

a=dvdt=dvdx⋅dxdt=vdvdx. a = \frac{dv}{dt} = \frac{dv}{dx}\cdot\frac{dx}{dt} = v\frac{dv}{dx}.a=dtdv​=dxdv​⋅dtdx​=vdxdv​.

Thus, if the velocity–displacement graph vvv vs xxx is known, then the acceleration–displacement graph is obtained using

a(x)=v(x) dvdx. a(x)=v(x)\,\frac{dv}{dx}.a(x)=v(x)dxdv​.

2. Why the figure is necessary

To determine which option is correct, we must know:

  1. the shape of vvv vs xxx,
  2. the slope dvdx\dfrac{dv}{dx}dxdv​ in each region,
  3. the corresponding option graphs A, B, C, D.

Without the figure, we cannot independently reconstruct the answer.

3. Comparison with stored answer

The stored correct answer is A. Since the visual information is missing, I cannot verify it from first principles using the prompt alone.

Given the stored answer and lack of the graph, I cannot confidently disagree. So I will mark agreement provisionally.

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