Question

The minute hand of a wall clock is 10 cm long.What is displacement and distance covered by its tip from 10:00am to 10:30am?

Answer 1

the displacement will be 20 cm and distance covered by its tip from 10:00 am to 10:30 am will be the 1/2 of the circumference of the clock 
= 1/2*2 (pie)r 
= 1/2*2*22/7*10 cm
= 15.71 cm

Answer 2

The displacement given is 20 cm
Distance covered is 10.00 to 10.30 is half the cirumference of clock
this means 1/2 of circumference
clock is a cicrle=circumference of circle
1/2circumference of circle
= 1/2*2πr
= 1/2*2*22/7*10 cm
=220/7
= 31.42c,