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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
$A$ block of mass $m$ moving with a velocity $v_0$ on a smooth horizontal surface strikes and compresses a spring of stiffness $k$ till mass comes to rest as shown in the figure. This phenomenon is observed by two observers:

$A$: standing on the horizontal surface

$B$: standing on the block 

To an observer $B$, when the block is compressing the spring

  • A
    velocity of the block is decreasing
  • B
    retardation of the block is increasing
  • ✓
    kinetic energy of the block is zero
  • D
    all the above
✓

Answer

Correct option: C.
kinetic energy of the block is zero
c

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