Question

Zubin covers one lap of a circular track of radius 14 m in 22 seconds.

a. If he keeps moving around the track, what is his displacement at the end of 1 minute 17 seconds?
b. If he runs in a straight line with the same speed, what distance will he cover in 5 minutes?

Answer 1

Answer:

a. 28 m

b. 1200 m

Explanation:

a. convert 1 min 17 seconds to seconds as it is the si unit of time.

 1 min 17 s= 77 s

   after 77 sec he will complete 3.5 rounds as displacement is shortest distance from initial and final position the displacement= 2r(0.5 round)

                                                                                            =28m

b. speed = 4 m/s

   time= 300s

 distance = speed * time

                =4*300

                =1200 m

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Answer 2

Explanation:

First convert 1minute 17 seconds to seconds.

1 min 7 sec=77sec

After 77 sec he will complete 3.5 rounds as the displacement is shortest distance. It is from the initial and final position of the displacement.

=28 m

speed=4m/s

time =300 sec

distance =speed x time

distance= 4 x 300

1200m