An object is moving across a surface, but it does not gain or lose speed. which best describes the object’s force? the net force is positive. the net force is zero. the positive force is greater than the negative force. the negative force is greater than the positive force.

the net force is zero.

Explanation:

According to Newton's second law, the acceleration of an object is proportional to the net force acting on the object:

where

F is the net force

m is the mass of the object

a is the acceleration

In this problem, the object is moving without gaining or losing speed. It means that its speed is constant, so the acceleration is zero: therefore, the net force must be zero as well.

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.