find the displacement and distance of a circular track of radius 5cm and timetaken by it is 2min 30sec . while the body taken 30sec to complete 1 round.

2
can you plz check the question once ,i think some thing is wrong in it
yes, i have checked
I also think that something is missing in the question and if question is right then it's a puzzle as it does not matter how much is taken to complete a round the displacement of a circular path is zero so d=0
And the distance will be ..
distance-2*3.14*5
31.4 cm of 1 round
for 5 round=31.4*5
157 cm

Answers

2014-05-16T19:31:13+05:30
Displacement-0 cm
distance-2*3.14*5
            31.4 cm of 1 round
for 5 round=31.4*5
                 157 cm
1 5 1
2014-05-16T22:13:00+05:30
Displacement is zero as it reaches the same point.
distance=2πr (circumference)
=2*3.14*5
=31.4 m for 1 round            (2 min 30 sec=2*60 sec+30 sec=150 sec)
30 sec----->31.4 m
150 sec---->?  Let it be x
30x=31.4*150
x=31.4*5
x=157 m
In 2 min 30 sec,it travels 157 m distance in 5 rounds.
2 5 2