If you measured the final velocity of the car to be 1 m/s and the initial mass of the car remains the same, how much coal was added to the car in kg

Complete Question

The complete question is shown on the first uploaded image

a

b

c

Explanation:

From the question we are told that

     The mass of the coal car is  

     The velocity is  

     The load of coal dropped is

Generally the momentum of the system before the coal is added is mathematically represented as

=>        

=>        

Generally from the law of momentum conservation is mathematically represented as

Here is the velocity of the load before it is dropped and the value is 0 m/s

So

 =>    

=>    

When v =  1m/s  and   remain the same

Then

=>    

=>    

=>      

the results is a decrease in air temperature with an increase of altitude.

explanation: