Two friends of different masses are on the playground. they are playing on the seesaw and are able to balance it even though their masses are different.

how are they able to balance on the seesaw?

1) they are able to balance torques due to gravity.
2) they are able to balance their respective energies.
3) all of these.
4) their densities are the same.
5) they are able to balance forces due to gravity.
6) they are able to balance their respective momenta.

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.

80cm/s.

24cm/s.

53.3cm/s.