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Physics - W.E.P. Question with Solution | TestHub

PhysicsW.E.P.Calculation of workEasy2 minPYQ_2013

PhysicsEasysingle choice

A uniform force of $(3 i + j) N$ acts on a particle of mass $2 kg$ . Hence the particle is displaced from position $(2 i + k) m$ to position $(4 i + 3 j - k) m$ . The work done by the force on the particle isNEET 2013 (All India)

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Solution:

Given, force $F = 3 i + j$ $r_{1} = (2 i + k) m and r_{2} = (4 i + 3 j - k) m ∴ s = r_{2} - r_{1} = (4 i + 3 j - k) - (2 i + k) = (2 i + 3 j - 2 k) m ∴ W = F \cdot s = (3 i + j) \cdot (2 i + 3 j - 2 k) = 3 \times 2 + 3 + 0 = 6 + 3 = 9 J$

Stream:NEETSubject:PhysicsTopic:W.E.P.Subtopic:Calculation of work

⏱ 2mℹ️ Source: PYQ_2013

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