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The kinetic energy of an object of mass, m moving with a velocity of 5 m s–1 is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?

Class 9 Physics
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Write an expression for the kinetic energy of an object.

Class 9 Physics
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What is the kinetic energy of an object?

Class 9 Physics
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A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?

Class 9 Physics
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Define 1 J of work?

Class 9 Physics
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Write an expression for the work done when a force is acting on an object in the direction of its displacement.

Class 9 Physics
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When do we say that work is done?

Class 9 Physics
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A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (Fig. 11.3). Let us take it that the force acts on the object through the displacement. What is the work done in this case?

Class 9 Physics
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A stone is thrown vertically upward with an initial velocity of 40 m/s. Taking g = 10 m/s2, find the maximum height reached by the stone. What is the net displacement and the total distance covered by the stone?

Class 9 Physics
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. A ball is thrown vertically upwards with a velocity of 49 m/s. Calculate (i) the maximum height to which it rises, (ii) the total time it takes to return to the surface of the earth.?

Class 9 Physics
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Gravitational force on the surface of the moon is only 1 6 as strong as gravitational force on the earth. What is the weight in newtons of a 10 kg object on the moon and on the earth?

Class 9 Physics
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Why will a sheet of paper fall slower than one that is crumpled into a ball?

Class 9 Physics
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