Question
In coming to a stop, a car leaves skid marks 73 m long on the highway....
In coming to a stop, a car leaves skid marks 73 m long on the highway.
Assuming a deceleration of 6.50 m/s2 , estimate the speed of the car just before braking.
Homework Answers
Answer #1
Given:-
- Car leaves skid marks over the distance :
- Deceleration of the
car
:
By kinematic equation,
Where,
: is the final speed of the car
: is the initial speed of the car.
: is the acceleration of the car.
: is the final speed of the car
: is the initial speed of the car.
: is the acceleration of the car.Since the car is going to stop, final speed of the car will be
zero : 
, therefore,
Acceleration is negative because its direction is opposite to motion of the car i.e. deceleration.
This is the speed of the car just before braking.
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