Question

Sn athlete runs along a circular track of diameter 28m.The displacement of the athlete is​

Answer 1

Time taken = 5 seconds

The time taken by ultrasound signal to travel from the submarine to the object will be half of this time:

=5/2

= 2.5 seconds

We know that,

Speed = Distance/Time

= 3625/2.5m

= 1450 m/s

Therefore, the speed of sound is 1450 m/s.

Answer 2

Answer:

displacement is know as the shortest distance traveled from intial position to the final position. so the position he started where the position he ended thus , displacement will be zero.