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. (a= acceleration, v= velocity, x= displacement, t= time)abcd
(A)a, b, c
(B)a
(C)b, c
(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 v=at, a straight line through the origin, matching graph b. The displacement goes as x=21at2, a parabola opening upward, matching graph d. The one that does not fit is the velocity plotted against displacement: from v2=2ax we get v∝x, 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