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Work, Energy, Power and Collision — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsWork, Energy, Power and Collision1 Mark
MCQ
A ball hits a vertical wall horizontally at $10 \mathrm{~m} / \mathrm{s}$ bounces back at 10 $\mathrm{m} / \mathrm{s}$
  • A
    There is no acceleration because $10 \frac{\mathrm{m}}{\mathrm{s}}-10 \frac{\mathrm{m}}{\mathrm{s}}=0$
  • B
    There may be an acceleration because its initial direction is horizontal
  • ✓
    There is an acceleration because there is a momentum change
  • D
    Even though there is no change in momentum there is a change in direction. Hence it has an acceleration
✓

Answer

Correct option: C.
There is an acceleration because there is a momentum change
(c) As the ball bounces back with same speed so change in momentum $=2 \mathrm{mv}$ and we know that force $=$ rate of change of momentum i.e. force will act on the ball so there is an acceleration.

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