Question 15 of 121

A body is moving with constant speed, in a circle of radius $10m$. The body completes one revolution in $4s$. At the end of $3rd$ second, the displacement of body (in $m$) from its starting point is:

A$30$B$15\pi$C$5\pi$D$10\sqrt{2}$

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Answer: (D) $10\sqrt{2}$

Give: $r=10m$, $T=4s$.
Displacement is defined to be the change in position of an object. As we can see from the above figure, displacement will be $d=\sqrt{{r}^{2}+{r}^{2}}$
$\Rightarrow d=10\sqrt{2}m$