Mechanical energy is the blank of kinetic energy and potential energy

Mechanical energy is the sum of kinetic energy and potential energy

Explanation:

Mechanical energy is the sum of kinetic energy and potential energy. Mathematically, it is equal to :

ME = KE + PE

Where

KE = kinetic energy

PE = potential energy

m = mass of an object

g = gravity

h = height above ground level

Mechanical energy is possessed due to the motion of an object and its position. Motion of an object is given by the kinetic energy and the energy possessed due to its position is given by its potential energy.  

Hence, mechanical energy is the sum of kinetic energy and potential energy.

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.

it's a b and