A 747 jetliner lands and begins to slow to a stop as it moves along the runway. if its mass is 3.50 x 10^5 kg. it speed is 75.0 m/s and the net breaking force is 7.25 x 10^5 N, what is its speed 10.0 seconds later? how far has it traveled in this time?

The speed after 10 s is 54.29 m /s.The distance traveled at that time is 646 m.

Explanation:

First calculate the deceleration rate:

                                     a = F/m

                                       = (7.25 10^5 N) / (3.5 10^5 kg)

                                    a = 2.071 m/s^2 .

At that deceleration rate, the speed after 10 s later is reduced by,

                 speed = 10 2.071

                             = 20.71 m / s making the speed as 54.29 m/s at that time.

  (i.e. subtracting the two speeds = 75 m/s - 20.71 m/s = 54.29 m / s.)

For the distance traveled, multiply the average speed by 10 s.

          Average speed =( 75 m/s + 54.29 m/s) / 2 = 64.645 m / s.

      distance traveled = average speed time

                                     = 64.645 10

distance traveled = 646 m.

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

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