1. A race car moves along a circular track of radius 100m at a velocity of 25m/s. (a) What is the time taken to complete one lap of the circular track. (b) What is the time taken for 10
laps.

Given :

A race car moves along a circular track of radius 100m at a velocity of 25m/s.

To Find :

(a) What is  the time taken to complete one lap of the circular track.

(b) What is the time taken for 10  laps.

Solution :

Circumference of circular track,

a) Time taken to complete one lap is :

b) Time taken to complete 10 laps is :

Hence, this is the required solution.

the answer is 3.1 his answer is wrong mines is right

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me