Which best compares the initial momentum of the boy with
the final momentum of the boy/boat system?
the initial momentum of the boy is zero because the
velocity cancels with the mass of the boy.
the initial momentum of the boy is greater than the
boy/boat because the boy has a greater velocity than the
boat.
the initial momentum of the boy is less than the boy/boat
because the boy has less mass than the boat.
the initial momentum of the boy is equal to the boy/boat
because the final velocity of the boat is less than the initial
velocity of the boy.

The independent variable would be the fertilizer as it is what the dependent variable (the growth of grass) depends on.

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

F= (mass)(acceleration) = mam = 0.25 kgvi = 16 m/st = 2 svf = 0 m/s (since it was put to stop)a=(vf-vi)/ta=(0-16)/2a = 8 m/s^2 (decelerating)f = ma = (0.25 kg)(8 m/s^2)f = 2 nhope this !