Identify each type of energy as mechanical or non-mechanical.

- Kinetic energy

- Gravitational potential energy

Explanation:

The term 'mechanical energy' refers to the sum of the kinetic energy and the gravitational potential energy of an object, therefore all the other choices are excluded.

The kinetic energy of an object is the "energy of motion", and it is given by:

where m is the mass of the object and v is its speed.

The gravitational potential energy of an object is the potential energy that it has because of its height above the ground, and it is given by

where m is the mass, g is the gravitational acceleration and h is the height above the ground.

The sum of these two energies makes the mechanical energy of an object:

kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.

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.