8. A rock falls off a cliff and hits the ground 5 seconds later. It experiences an acceleration of 10 m/s2.
(a) Sketch the speed-time graph for the rock for t = 0 s to t = 5 s.
(b) Calculate the height of the cliff.
(c) Determine the distance in which the rock fell between the 2nd and 3rd second.​

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.

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

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