The brakes on your automobile are capable of creating a deceleration of 4.6 m/s^2. if you are going 114 km/h and suddenly see a state trooper, what is the minimum time in which you can get your car under the 79 km/h speed limit? (the answer reveals the futility of braking to keep your high speed from being detected with a radar or laser gun.)

The minimum time to get the car under max. speed limit of 79 km/h is 2.11 seconds.

Explanation:

isolating "t" from this equation:

Where:

a= (negative because is decelerating)

First we must convert velocity from km/h to m/s to be consistent with units.

So;

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min