(a)
The average force exerted on the car by the barrier.
(a)
Answer to Problem 18P
Explanation of Solution
Given:
Mass of the car is
Initial velocity of the car is
Final velocity of the car is
The time interval at which the car comes to rest after smashing with the barrier is,
Formula used:
The average force acting on the car is the rate of change of its momentum. That is,
Where,
Calculation:
Substituting the numerical values in equation
Negative sign indicates that the force acting on the car is in the direction opposite to its direction of motion.
Conclusion:
The average force exerted on the car by the barrier is
(b)
The average deceleration of the car.
(b)
Answer to Problem 18P
Explanation of Solution
Given:
Initial velocity of the car is
Final velocity of the car is
The time interval at which the car comes to rest after smashing with the barrier is,
Formula used:
The average deceleration
Calculation:
Substituting the numerical values in equation
Conclusion:
The average deceleration of the car is
Chapter 7 Solutions
Physics: Principles with Applications
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