If a ball moves from P to Q in 3s and from P to R in 9s, what is its average velocity when it moves from Q to R.

a. 7.85 m/s
b. 7.00 m/s
c. 8.85 m/s
d. 8.00 m/s

The time required for the ball to move from
 Q to R is given as
t = 9 - 3 = 6 s

The distance from Q to R is given as 
s = p 30 /2 = 47.12 m

The average velocity of ball from Q to R is given by
vavg = Total distance/Total time
vavg = 47.12/6 = 7.85 m/s
             
The average velocity of the ball when it moves from Q
to R is 7.85 m/s