Question

A particle moves in a circle of radius 4 m clock wise at constant speed of 2 m $s^{-1}$. If $\hat{x}$ and $\hat{y}$ are unit vectors along x and y axes, respectively, the centripetal acceleration of the particle at the instant half between PQ is given by

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

$a=\frac{v^2}{r}=1m/s^2$

$\overline{a}=-acos{45}^0\left(\hat{x}\right)-asin{45}^0\left(\hat{y}\right)$