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

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics5.work,energy,power and collision1 Mark
MCQ
An object is at the top of a smooth sphere which is kept fixed. As object slides down  after being given a negligible side push, magnitude of acceleration of object during its motion till it reaches ground
  • A
    Increased and then decreases
  • B
    Decreases then becomes constant
  • ✓
    Increases and then becomes constant
  • D
    Continuously increases.
✓

Answer

Correct option: C.
Increases and then becomes constant
c
up to when block have contact with sphere its net

$a_{ne t}=\sqrt{a_{t}^{2}+a_{c}^{2}}$ increases as $v \uparrow$ after that

only acceleration of block will be acceleration due to gravity.

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