Hello student,

I hope you are doing well.

Average velocity = total displacement / total time taken

Total displacement of the particle = (1 - 3/4) of the circumference

=> (4 - 3)/4

=> 1/4  of the circumference .

=> 1/4 × 2 πr

=> πr/2

=> π × 1/2

=> π/2

Average velocity = ( π/2 ) / (10) = π/20

The average velocity will be π/20 m/s .

I hope it helps.