A man has three friends help him push his stalled car on a horizontal surface. The friends push with a constant total force of 1200 N. How far must the car be pushed, starting from rest, so that its final kinetic energy is 4200 J? (Disregard friction.)

The  Disregard friction of the given problem is 3.5 m

Explanation:

We  have the formula,

Disregard friction= Final kinetic energy / Constant total force

Disregard friction=4200J/1200N

Disregard friction=3.5m

The  Disregard friction of the given problem is 3.5 m

i believe the answer is a

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.