Concept explainers
(a)
The stopping distance for a car.
(a)
Answer to Problem 28P
The stopping distance for a car is
Explanation of Solution
Given:
The initial speed of the car
Human reaction time
Acceleration of the car
Final velocity of the car
Formula used:
The car travels with uniform
Therefore,
The brakes are applied when the car is at the position
The following equation of motion can be used to determine the position of the car when it comes to rest.
Calculation:
Express the initial speed of the car in m/s.
Using equation (1) calculate the position
Rewrite equation (2) for
Substitute the values of the variables in equation (3) and calculate the stopping distance.
Conclusion:
Thus, the stopping distance for a car for an acceleration of
(b)
The stopping distance for a car.
(b)
Answer to Problem 28P
The stopping distance for a car is
Explanation of Solution
Given:
The initial speed of the car
Human reaction time
Acceleration of the car
Final velocity of the car
The position of the car when the brakes are applied will remain same as in (a), since the velocity and the reaction time remain the same.
Formula used:
Calculation:
Substitute the values of variables in equation (3) and calculate the stopping distance.
Conclusion:
Thus, the stopping distance for a car for an acceleration of
Chapter 2 Solutions
Physics: Principles with Applications
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