Explanation:
The angular momentum is defined as the product of the moment of inertia of the body and the angular velocity of the object.
In the given problem, Lifeguards love to spin their whistles. The person spins the whistle about fixed axis by using his fingers.
In this case, the whistle is moving about the fixed axis with the angular velocity. Then there will be angular momentum.
To solve this problem we will use the Force equation according to the definition given in Newton's second law. There we have that the Force is equal to

Where,
m = mass
a = acceleration
Our values are given as



Considering that both mass are equal to one, we have that:



Therefore the truck exert a force on the car of 11kN
Answer: E = 7394.6N/C
Explanation:
Please find the attached file for the solution