a train is travelling with your speed of 72 km per hour drive the diet the driver apply so that a uniform acceleration of - 0.2 M per second inverse is produced the distance travelled by the train before his comes to rest is

Question

a train is travelling with your speed of 72 kmph. Drivers applies brakes so that a uniform acceleration of - 0.2 M per second inverse is produced the distance travelled by the train before his comes to rest is

Answer 1

Initial velocity u = 72 kmph = \(72 \times \frac {5}{18}= 20\,m/s\)

Acceleration a = −0.2ms^-1, Final velocity v = 0

We know v² - u² = 2as

⇒ (0)² - (20)² = 2(- 0.2) x s

s = 1000 m ⇒ s = 1 km