Question

please answer the question in photo​

Answer 1

Answer:

look at the dark dot in my diagram.

this wheel completes 1 and 1/2 rounds

1 revolution=it means total circumference (2πR)

1/2 revolution = this means 1/2 of it's circumference (πR)

if I draw a dot at the bottom of the circle After completing 1 round it must come to the same position (in this situation it has completed one revolution)

but in here wheel had to travel another 1/2 revolution means 1/2 of its circumference..then the dot will stop at the top

(look at my diagram them you will understand)

to find the displacement you have to find the red line based on my diagram