Traveling at a speed of 18.5 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. the coefficient of kinetic friction between the tires and the road is 0.630. what is the speed of the automobile after 1.25 s have elapsed? ignore the effects of air resistance.

10.774625 m

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration

g = Acceleration due to gravity = 9.81 m/s²

= Coefficient of kinetic friction = 0.63

m = Mass

f = Frictional force

Equation of motion

The speed of the automobile after the time has elapsed is 10.774625 m

what is the question because that is not a question.

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.