Home Physics Motion in a Straight Line Position, Path Length and Displacement A particle is moving in a plane with velocit…
Physics Motion in a Straight Line Position, Path Length and Displacement MCQ (Single Correct)

A particle is moving in a plane with velocity given by = u 0 + (a ω ω cos ω ω t) , where and are unit vectors along x and y axis, respectively. If the particle is at origin at t = 0, the distance from origin at time 3 π π /2 ω ω is

A
a 2 + ω ω 2
B
C
D

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The correct answer is:
B

Given, u = u 0 + (a ω ω cos ω ω t)

Thus velocity along y axis, U y = a cos ω ω t and velocity along x axis, vx = u 0 .

Displacement at time t in horizontal direction,

x =

and y =

Eliminating t, y = a sin ( ω ω x/u 0 )

At time 3 π π /2 ω ω , x = u 0 (3 π π /2 ω ω )

and y = a sin 3 π π /2 = -a

Thus distance of particle from origin

S =

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