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

Gujarat BoardEnglish MediumSTD 11 SciencePhysics5.work,energy,power and collision1 Mark
MCQ
If a lighter body (mass ${M_1}$ and velocity ${V_1}$) and a heavier body (mass ${M_2}$ and velocity ${V_2}$) have the same kinetic energy, then
  • A
    ${M_2}{V_2} < {M_1}{V_1}$
  • B
    ${M_2}{V_2} = {M_1}{V_1}$
  • C
    ${M_2}{V_1} = {M_1}{V_2}$
  • ✓
    ${M_2}{V_2} > {M_1}{V_1}$
✓

Answer

Correct option: D.
${M_2}{V_2} > {M_1}{V_1}$
d
(d)$P = \sqrt {2\,mE} .$If kinetic energy are equal then $P \propto \sqrt m $
i.e., heavier body posses large momentum
As ${M_1} < {M_2}$therefore ${M_1}{V_1} < {M_2}{V_2}$

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