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Q.

An apple falls from a tree because of gravitational attraction between the earth and the apple. If F1 is the magnitude of the force exerted by the earth on the apple and F2 is the magnitude of the force exerted by the apple on the earth, then


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a

F1 is very much greater than F2

b

F2 is very much greater than F1

c

F1 is only a little greater than F2

d

F1 and F2 are equal 

answer is D.

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Detailed Solution

If F1 is the magnitude of the force exerted by the earth on the apple and F2is the magnitude of the force exerted by the apple on the earth, then F1 and F2are equal.
The law of gravitation states that every object attracts every other object on the earth with force directly proportional to the masses of both objects and inversely proportional to the square of the distance between them. It is given by the formula,
 F=m1 m2r2 Where G is the gravitational constant, m1 and  m2 are the masses of the objects, and r is the distance between the objects.
The force of attraction between any two same objects is equal. Thus, F1 and F2 are equal.
 
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