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Standard VIII

Physics

Viscosity

The speed of ...

Question

The speed of a falling body increases continuously. This is because:

no force acts on it

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it is very light

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air exerts a frictional force along the direction of motion

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the earth attracts it

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Solution

The correct option is B the earth attracts it
The gravitational force for a falling object is along the direction of motion. Hence, its speed increases continuously till it touches the ground.
Option D is correct.

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Similar questions

Q. Consider the following statements:
(a) No net force acts on a rain drop falling vertically with a constant speed.
(b) If net force acting on the body is zero, momentum of the body remains constant.
(c) Particle of different masses falls with different acceleration on earth.
(d) It is easier to start motion in a heavier body than a lighter body.
Which of the above statements are correct?

Q. The frictional force acts in the direction on a drop of rain falling down with constant speed.

Q. Question 15
An apple falls from a tree because of gravitational attraction between the earth and apple. If

F_{1}

is the magnitude of force exerted by the earth on the apple and

F_{2}

is the magnitude of force exerted by apple on earth, then

(a)

F_{1}

is very much greater than

F_{2}

(b)

F_{2}

is very much greater than

F_{1}

(c)

F_{1}

is only a little greater than

F_{2}

(d)

F_{1}

and

F_{2}

are equal

It is stated that every action has a equal and and opoosite direction so if a body is at rest and there there is no net externel force acting on it so there are any other force acting on the body like frictional is the force acts when only a body is in motion

Q. An apple falls from a tree because of gravitational attraction between the earth and apple. If

F_{1}

is the magnitude of force exerted by the earth on the apple and

F_{2}

is the magnitude of force exerted by apple on earth, then

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The speed of a falling body increases continuously. This is because:

The correct option is B the earth attracts itThe gravitational force for a falling object is along the direction of motion. Hence, its speed increases continuously till it touches the ground.Option D is correct.

The correct option is B the earth attracts it
The gravitational force for a falling object is along the direction of motion. Hence, its speed increases continuously till it touches the ground.
Option D is correct.