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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
Which of the following statements is incorrect?
  • A
    Most of the collisions on the macroscopic scale are inelastic collisions.
  • ✓
    In a perfectly inelastic collision, there is complete loss of $KE$
  • C
    Forces involved in an elastic collision are conservative in nature
  • D
    Oblique collision is that collision in which the colliding bodies do not move along the same straight line path
✓

Answer

Correct option: B.
In a perfectly inelastic collision, there is complete loss of $KE$
b
In perfectly inelastic collision both bodies will

more with same velocity

$\mathrm{m}_{1} \mathrm{u}_{1}+\mathrm{m}_{2} \mathrm{u}_{2}=\left(\mathrm{m}_{1}+\mathrm{m}_{2}\right) \mathrm{v}$

final $KE$ has some value because of velocity

Option $(2)$ is wrong

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