Question

A particle is moving in a uniform circular motion with radius 'r'. In quarter
revolution, the distance and the displacement covered by the particle is
1) πr,r
2) 0.5mr, √2r
3) 0.5 πr,2r
4) m, √2r​

Answer 1

Explanation:

Swati's rank is 19th from the bottom and Purshottam is 6 ranks below Swati so the rank of Purshottam from bottom=19-6=16

So the rank of Purshottam from Top=45-16=29+1=30th

Answer 2

$\huge{ \mathtt{\green{heyya \: mate}}}$

$according \: to \: pythagoras \: theorem$

${ab}^{2} + {bc}^{2} = {ac}^{2}$

${r}^{2} + {r}^{2} = {x}^{2}$

${2r}^{2} = {x}^{2}$

$x = \sqrt{2 {r}^{2} }$

$x = \sqrt{2} r$

SO, THE CORRECT ANSWER IS OPTION (D)