If position vector of a particle at time $t$ is $\vec{r}=3 t \hat{i}+(8-4 t) \hat{j} \mathrm{~m}$, then

Particle is moving with variable velocity in straight line

Particle moving is in parabolic path

NEET UG PHYSICS MCQ: MOTION IN A STRAIGHT LINE

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If position vector of a particle at time

t

\vec{r}=3 t \hat{i}+(8-4 t) \hat{j} \mathrm{~m}

, then

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Correct option: A

Particle is moving with constant velocity in straight line

Option A (Particle is moving with constant velocity in straight line) is correct because the position vector is a linear function of time, indicating constant velocity.

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? Two cars are moving in the same direction with a speed of

30\mathrm{km}{\mathrm{h}^{ - 1}}

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1 \mathrm{~ms}^{-2}

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. After how much time, the car catches up with the scooter? A motor vehicle travelled the first one third of a distance ‘S ’ at a speed of

{V_1} = 10\,kmph

, the second one third at a speed of

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and the last one third at a speed of

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