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4.1 , newtons laws of motion — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics4.1 , newtons laws of motion1 Mark
MCQ
$100 \,g$ of a iron ball having velocity $10 \,m/s$ collides with a wall at an angle ${30^o}$ and rebounds with the same angle. If the period of contact between the ball and wall is $0.1 \,second$, then the force experienced by the ball is ............. $\mathrm{N}$
  • A
    $100$
  • ✓
    $10$
  • C
    $0.1$
  • D
    $1$
✓

Answer

Correct option: B.
$10$
b
(b) $F = $ Rate of change in momentum
$ = \frac{{2mv\sin \theta }}{t}$
$ = \frac{{2 \times {{10}^{ - 1}} \times 10\sin 30^\circ }}{{0.1}}$
$F = 10\,N$

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