If the car’s speed decreases at a constant rate from 71 mi/h to 50 mi/h in 3.0 s, what is the magnitude of its acceleration, assuming that it continues to move in a straight line? what distance does the car travel during the braking period?

The acceleration and the distance are 25200 mi/h² and 0.1008 mi.

Explanation:

Given that,

Initial speed = 71 mi/h

Final speed = 50 mi/h

Time = 3.0 s

(a). We need to calculate the acceleration

Using equation of motion

Put the value in the equation

Negative sign shows the deceleration.

(b). We need to calculate the distance

Using equation of motion

Hence, The acceleration and the distance are 25200 mi/h² and 0.1008 mi.