Question

Which of the following is not a unit of work ?
(A) kg m/s2
(B) kg m/s2
(C) Nm
(D) joule​

Answer 1

Answer:

Nm

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Answer 2

kgm/s² is not a unit of work (Option - A = B)

• Work done is given by the formula W = Force(F) × displacement (s)
• W = F × s
• Formula for force = mass(m) × acceleration(a)
• W = m × a × s
• Acceleration = velocity(v)/time(t)
• W = m × v × s/t
• Velocity = s/t
• W = m × s²/t²
• Therefore, unit of work done = kgm²/s²
• S.I unit for Force F = ma = kgm/s² , Also, called Newton(N).
• W unit = Nm
• S.I unit of W = Joule (J)
• W unit can also be written as kiloJoule(kJ) calorie (cal) or kilocalorie(kcal)

• Hence kgm/s² is the unit for Force and not for work done.