For a given initial velocity, how does the time td it takes to stop on dry snow differ from the time tw it takes to stop on wet snow

let the friction coefficient on dry ice and wet ice is different and given as

= on dry ice

= on wet ice

now by friction force formula we can say

so the deceleration due to friction force is given as

now the deceleration due to friction force on both surface is given as

now the time to stop the two blocks can be calculated by kinematics

also for other block on wet ice we can say similarly

now the ratio of two time on two surfaces is given as

so this is the ratio of time on two surfaces

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.

i really dont know but i will try okay.

so i think u would just add all them up and get your answer..