3.12. A car is moving with a velocity of 20 m/s. The driver sees a stationary truck ahead at a distance of 100 m. After some reaction time at the brakes are applied producing a retardation of 4 m/s". What is the maximum reaction time to avoid collision ? Answer is 2.5s how??? Step by step explanation pls

3.12. A car is moving with a velocity of 20 m/s. The driver sees a sta

1.	3.12. A car is moving with a velocity of 20 m/s. The driver sees a stationary truck ahead at a distance of 100 m. After some reaction time at the brakes are applied producing a retardation of 4 m/s". What is the maximum reaction time to avoid collision ? Answer is 2.5s how??? Step by step explanation pls
Answer» 2.5 secExplanation:v=u+at0=20–4t4t=20t=5 secsd=v1 + V2 / 2 X tv2=0, sod=0+20/2 x 5=50mThe car STOPS in 50m. That means it has 50m to react. Then: 50m/20 m/s=2.5 secs to react

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