Question

A wall clock has a $5cm$ long minute hand. The average velocity of the tip of the hand reaching $06.00$ hrs. to $18.30$ hrs. is

• A. $2.2\times {10}^{-4}$ $cm/s$
• B. $1.2\times {10}^{-4}$ $cm/s$
• C. $5.6\times {10}^{-4}$ $cm/s$
• D. $3.2\times {10}^{-4}$ $cm/s$

Answer 1

The correct option is A $2.2\times {10}^{-4}$ $cm/s$

Total displacement of the minute hand will be

$s=10cm$

Total time in covering the distance is 12 hr 30 min or , $t=45000seconds$

Therefore, average velocity is,
$v_{avg}=\frac{10}{45000}=2.2\times {10}^{-4}cm/s$