9.
force is a quantity that is measured using the standard metric unit known as the

a. m/s
b. meter
c. newton
d. joule

Newton is the unit of the force in standard metric.  

Option: C

Explanation:

The physical quantity which has both direction and magnitude is force. Force is also known as to be a pull or push of an object with respect to its mass that is responsible for the change in velocity (acceleration). To give motion for an object from one place to another force is to be applied on an object.

So, Force= mass x acceleration = kg x = Newton (N)

Symbolically Newton is represented as N.

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.