NEET UG PHYSICS MCQ: WORK-ENERGY-POWER

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A ball of mass m moves with speed v and strikes a wall having infinite mass and it returns with same speed then the work done by the ball on the wall is

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Correct option: A

Zero

Option A (Zero) is correct because the wall's displacement is zero, hence no work is done on the wall.

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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}}

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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}}

. The diameter of the are is