You are driving along the New York State Thruway in a line of cars all travelling at a constant speed of 108.5 km/hr. The car in front of you applies its brakes for maximum acceleration. You then apply your brakes to achieve the same maximum acceleration after only a 1 s delay due to reaction time. What distance behind the car in front of you must you be to avoid a collision?

Car first should be 30.13 m behind the second car.

Explanation:

Given that,

Constant speed = 108.5 Km/hr

Time = 1 sec

Let the distance covered by second car S and by first car S'

We need to calculate the distance covered by second car

Using equation of motion

.....(I)

The distance covered by first car to avoid collision

Put the value into the formula

...(II)

We need to calculate the distance covered by first car

Using equation (I) and (II)

Put the value into the formula

Hence, Car first should be 30.13 m behind the second car.

positive reinforcement? ?