Consider the following statements : (1) A light and a heavy body, hav

1.	Consider the following statements : (1) A light and a heavy body, having equal momenta, have equal kinetic energies. (2) The total energy of a body in motion is equal to the work it can do in being brought to rest. (3) A body cannot have momentum when its energy is zero. Which of these statement(s) is/are correct ? (a) (1) and (2) (b) (2) and (3) (c) Only (2) (d) Only (3)
Answer» The correct option is: (d) Only (3) Explanation: Because they have equal momenta, hence equal mv, the heavy body will move very slowly and the light body will move very quickly. As Kinetic energy is 1 / 2 mv² . Thus the speed of the light body will be high giving higher kinetic energy to it in comparison to the kinetic energy of heavy body.

Consider the following statements : (1) A light and a heavy body, having equal momenta, have equal kinetic energies. (2) The total energy of a body in motion is equal to the work it can do in being brought to rest. (3) A body cannot have momentum when its energy is zero. Which of these statement(s) is/are correct ? (a) (1) and (2) (b) (2) and (3) (c) Only (2) (d) Only (3)

Answer»

The correct option is: (d) Only (3)

Explanation:

Because they have equal momenta, hence equal mv, the heavy body will move very slowly and the light body will move very quickly. As Kinetic energy is 1 / 2 mv² . Thus the speed of the light body will be high giving higher kinetic energy to it in comparison to the kinetic energy of heavy body.

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