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Answer:g=9.79
,A object of mass

at the surface of earth experiences a force

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Explanation:
Let
be the mass of earth.
Let
be the radius of earth.
Let
be the universal gravitational constant.
Given,




Let
be the acceleration due to gravity.
Then,


A object of mass
at the surface of earth experiences a force 
Depends on how strong you are. People can hit it anywhere between a few inches and 500 yards.
Answer:
I would love to help, Could you put the question in English?
Explanation:
Answer:
8400m
Explanation:
The engine that falls off would have the same constant horizontal velocity as the airplane's when if falls off if we ignore air resistance. So it would have a horizontal velocity of 280m/s for 30seconds before it hits the ground.
Therefor the horizontal distance the engine travels during its fall is
280 * 30 = 8400m
I need help to I have a big test and I need help so bad