JEE Main · 2019 · 08 Apr 2019 · Shift 2 · Kinematics

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A particle starts from origin O from rest and moves with a uniform acceleration along the positive x-axis. Identify all figures that correctly represent the motion qualitatively. ( acceleration, velocity, displacement, time)
Structure a
a
Structure b
b
Structure c
c
Structure d
d
  1. (A)a, b, c
  2. (B)a
  3. (C)b, c
  4. (D)a, b, d✓ Correct

Answer: (D)

Solution

Starting from rest with constant acceleration, look at what each quantity does. The acceleration stays constant, so its graph against time is a horizontal line, which matches graph a. The velocity grows as , a straight line through the origin, matching graph b. The displacement goes as , a parabola opening upward, matching graph d. The one that does not fit is the velocity plotted against displacement: from we get , which is not a straight line, so graph c is wrong. Hence the motion is correctly shown by a, b and d.

JEE Main · 2019 · 08 Apr 2019 · Shift 2 · Single correct option

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