The displacement of a particle at time t is given by \overrightarrow{x}=a \hat{i}+b t \hat{j}+\frac{c}{2} t^2 \hat{k} where a, b and c are positive constants. Then the particle is

Correct Answer is : accelerated along ∧k-direction

accelerated along \hat{k}-direction

decelerated along \hat{k}-direction

decelerated along \hat{j}-direction

accelerated along \hat{j}-direction

UPSC NDA I 2013 General Ability Paper

Question : 148 of 150

Marks: +1, -0

The displacement of a particle at time t is given by

→

∧

+bt

∧

+‌

∧

where a,b and c are positive constants. Then the particle is

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