a 2kg ball rolls down the hill. By the time it is at the bottom, the balls kinetic energy is 25 j. what is its velocity at the bottom of the hill?

KE = ½ mv²

25 J = ½ (2 kg) v²

v = 5 m/s

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c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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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.