The break of a car can slow it down from 60 miles per hour to 40 miles per hour in two secs how long it bring the car to a stop from an initial velocity of 25 miles per hour at the same acceleration
a = (60-40)/2 = 20mi/hr-s
So, to decelerate from 25 mi/hr to zero, it will take
(25mi/hr)/(20mi/hr-s) = 1.25s
(60-40)/2 = 20/2 = 10
so I get 2.5 seconds
To determine how long it takes for the car to come to a complete stop from an initial velocity of 25 miles per hour, we need to calculate the deceleration of the car.
From the given information, we know that the car slows down from 60 mph to 40 mph in 2 seconds. Therefore, we can determine the deceleration during this period using the formula:
Acceleration = (Final Velocity - Initial Velocity) / Time
Acceleration = (40 mph - 60 mph) / 2 seconds
Acceleration = -20 mph / 2 seconds
Acceleration = -10 mph/s
Note that the negative sign indicates that it is deceleration (opposite to acceleration).
Now that we have the deceleration, we can calculate how long it takes for the car to come to a complete stop from an initial velocity of 25 mph.
Using the formula:
Time = (Final Velocity - Initial Velocity) / Acceleration
Time = (0 mph - 25 mph) / (-10 mph/s)
Time = (-25 mph) / (-10 mph/s)
Time = 2.5 seconds
Therefore, it will take the car 2.5 seconds to come to a complete stop from an initial velocity of 25 miles per hour at the same acceleration.