Isolid iron ball of mass 770kg is used on a building site. the ball is suspended by a rope from a crane. the distance from the point of suspension to the centre of the mass of the ball is 12 m. the ball is pulled back from the vertical and then realeased, it falls through a vertical height of 1.6m and strikes the wall: what is the speed of the ball just before impact?

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.