(7) A 2500 lbm car moving at 25 mi/hr is accelerated at a constant rate of 15 ft/s2 up to a speed of 50 mi/hr. What is the force and total time required?

The  force is  

The time is  

Explanation:

From the question we are told that

  The  mass of the car is  

   The  initial velocity of the car is

   The final  velocity of the car is  

  The acceleration is  

Generally the acceleration is mathematically represented as

=>  

=>  

converting to seconds

=>    

Generally the force is mathematically represented as

=>      

=>      

Now converting to foot-pound-second we have  

=>        

the answer is a)

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