Question

A car runs at a constant speed on a circulat track of radius ` 100 m`. Taking `62.8 s` for every circular lap. The average velocity and average speed for each circular lap respectively are :
A. (a) ` 10 m//s. 0`
B. (b) ` 0,0,
C. (c ) `0, 10 m//s`
D. (d) ` 10 m//s. 10 m//s`

Answer 1

Correct Answer - C
Here ` r= 100 m, t= 62 sec`. As in one complete circular motion, car comes back to its starting point. So net displacement =0 and hence, bet velocity =0`.
Total path coverd in ` 62.8 sec = 2 pi r`
`=92 xx 3.14 xx 100 ) m = 628 m`
:. Average speed ` = ( 628)/(62.8) = 10 m//a.