Homework SourseThe driver of a car traveling at 250 ms applies the brakes a
The driver of a car traveling at 25.0 m/s applies the brakes and the car decelerates at a constant rate of 1.2m/s^2.
How far does it travel in 3.0s?
What\'s the car\'s speed after 3.0s?
The driver of a car traveling at 25.0 m/s applies the brakes and the car decelerates at a constant rate of 1.2m/s^2.
How far does it travel in 3.0s?
What\'s the car\'s speed after 3.0s?
How far does it travel in 3.0s?
What\'s the car\'s speed after 3.0s?
Solution
a) since the car deccelerates, the final velocity is zero and acceleration a = - a . so
s = u t + (1/2 ) at2
= ( 25 m/s ) ( 3.0 s ) - ( 0.5) (1.2 m/s2 ) (3.0 s )2
= 69.6 m
b)
speed of car after 3.0 s
v = d / t
= 69.6 m / 3.0 s
= 23.2 m/s
