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5.work,energy,power and collision — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics5.work,energy,power and collision1 Mark
MCQ
$Assertion$ : If collision occurs between two elastic bodies their kinetic energy decreases during the time of collision.

$Reason$ : During collision intermolecular space decreases and hence elastic potential energy increases.

  • ✓
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: A.
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
a
During collision intermolecular space decreases and hence elastic potential energy increases and since the total energy of system has to be constant $K.E.$ decreases for a very short period of time.

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