Q13 of 146 Page 145

Which would have a greater effect on the kinetic energy of an object: doubling the mass or doubling the velocity?

If the mass of a body is doubled, its kinetic also gets doubled and if the mass of a body is halved, its kinetic energy also gets halved.

If the velocity of a body is doubled, its kinetic energy becomes four times and if the velocity of a body is halved, then its kinetic energy becomes one- fourth.


It is obvious that doubling the velocity has a greater effect on the kinetic energy of a body than doubling its mass.


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11

If the speed of a body is halved, what will be the change in its kinetic energy?

 12

On what factors does the kinetic energy of a body depend?

 14

How fast should a man of 50 kg run so that his kinetic energy will be 625 J?

 15

State whether the following objects possess kinetic energy, potential energy, or both:

(a) A man climbing a hill


(b) A flying airplane


(c) A bird running on the ground


(d) A ceiling fan in the off position


(e) A stretched spring lying on the ground.