Question

Rohit completes a semicircular path of radius R in 10 seconds. Calculate average speed and average velocity in ms^–1. 

(A) [(2πR) / 10], (2R / 10) 

(B) (πR / 10), (R / 10) 

(C) (πR / 10), (2R / 10) 

(D) [(2πR) / 10], (R / 10)

Answer 1

Correct option: (C) (πR / 10), (2R / 10)

Explanation:

length AB = 2R 

arc AB = (1/2) circumference = πR 

average speed = {(arc AB) / (10)} = (πR / 10) 

average velocity = {(length AB) / (10)} = (2R / 10)