A car start from rest and affairs a velocity of 40m/s in 20s. If maintain this velocity for 30s and then comes for rest in 25s. Calculate the deceleration of the car
To calculate the deceleration of the car, we need to find the change in velocity and the time it takes for the car to come to rest.
The car starts from rest and accelerates to a velocity of 40 m/s in 20 seconds. Therefore, the acceleration can be calculated using the formula:
acceleration = (final velocity - initial velocity) / time
acceleration = (40 m/s - 0 m/s) / 20 s = 2 m/s²
The car maintains this velocity of 40 m/s for 30 seconds. Since there is no change in velocity, the acceleration during this period is 0 m/s².
Finally, the car comes to rest in 25 seconds. We can calculate the deceleration using the formula:
deceleration = (final velocity - initial velocity) / time
deceleration = (0 m/s - 40 m/s) / 25 s = -1.6 m/s²
The deceleration of the car is -1.6 m/s². The negative sign indicates that it is decelerating or slowing down.