NEET UG PHYSICS MCQ: WORK-ENERGY-POWER

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Understanding +4 | -1

Assertion: There is no loss in energy in elastic collision
Reason: Linear momentum is conserved in elastic collision

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Correct option: B

If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion

Option B (If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion) is correct because both statements are true, but conservation of linear momentum doesn't directly explain why there is no loss of energy.

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{A}

ball is dropped on the ground from a height of

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2\mathrm{\;m}{\mathrm{s}^{ - 1}}

and the boy changes his speed by

x = \mathrm{m}{\mathrm{s}^{ - 1}}

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\mathrm{m}{\mathrm{s}^{ - 1}}

is A force

\mathrm{\vec F} = - K\left( {y\hat i + x\hat j} \right)

(where K is a positive constant) acts on a particle moving in the x-y plane. Starting from the origin, the particle is taken along the positive x-axis to the point (a,0) and then parallel to the y-axis to the (a,a). The total work done by the force

\mathrm{\vec F}

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9.8\;\mathrm{m}{\mathrm{s}^{ - 1}}

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