An airplane releases a ball as it flies parallel to the ground at a height of 165 m. if the ball lands on the ground exactly 165 m from the release point calculate teh speed (v) of the plane. neglect andy effects due to air resistance and use g = 9.18 m/s^2 for the acceleration due to gravity.

Height of the ball when it is dropped from the plane is 165 m

So the time taken by the ball to reach the ground is given by

now the speed of the plane is given as

so it is flying at speed 28.4 m/s

the answer is a 3.8cm

explanation:

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.