If the sled is also being acted on by a constant kinetic friction force of 260 N and it started from rest, what is the final speed of the sled

Complete Question

The complete question is shown on the first uploaded image

a

b

Explanation:

From the question we are said that

        The  mass of the shed is  

        The pulling  force is  

        The  angle is  

        The  distance covered is  

        The kinetic force is  

Generally the work done is mathematically represented as

=>        

=>          

Generally according to the work-energy  theorem

Here   is total work done which is mathematically represented as

=>    

=>    

  Also    is the change in kinetic energy which is mathematically represented as

Here u  is the initial velocity of the shed when at rest

=>      

So

=>        

=>        

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.