Velocity of a particle moving in x-y plane is given by v = 3 i ^ + ( 4 − t ) j ^ where all the physical quantities are measured in SI unit :-

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PhysicsKinematics2-D & 3DMedium2 minQB

PhysicsMediummultiple choice

Velocity of a particle moving in x-y plane is given by $v = 3 \hat{i} + (4 - t) \hat{j}$ where all the physical quantities are measured in SI unit :-

Answer:

B, C, D

Solution:

$v = 3 i + (4 - t) j$ , $a = - j$ .

(A) At t = 3 s, $v_{x} = 3$ is nonzero - not parallel to y-axis - incorrect. (B) At t = 4 s, $v_{y} = 0$ - parallel to x-axis - correct.

(C) At t = 4 s, $v = 3 i$ and $a = - j$ are perpendicular - correct. (D) $v_{x} = 3$ always, so never parallel to the y-axis - correct.

Correct options: B, C, D

Subject:PhysicsTopic:KinematicsSubtopic:2-D & 3D

⏱ 2mℹ️ Source: QB

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