Assuming no air resistance, all projectiles have:

Explanation:

The motion of an object that move only under the action of gravity is called projectile motion.

All projectile have only acceleration due to gravity. In projectile motion, the horizontal movement of an object equals zero.

Equation of motion for a projectile are :

In horizontal motion,

Acceleration =

Velocity- time =

Displacement - time,

In vertical motion,

Acceleration =

Velocity- time =

Displacement - time,

Hence, this is the required solution.

most of them using statistics and defining how things are being measured

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.