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Motion in Two Dimension — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsMotion in Two Dimension1 Mark
MCQ
A ball thrown by a boy is caught by another after $2 sec$. some distance away in the same level. If the angle of projection is 30 , the velocity of projection is
  • ✓
    $19.6 m / s$
  • B
    $9.8 m / s$
  • C
    $14.7 m / s$
  • D
    None of these
✓

Answer

Correct option: A.
$19.6 m / s$
(a) $T=\frac{2 u \sin \theta}{g} \Rightarrow u=\frac{T \times g}{2 \sin \theta}=\frac{2 \times 9.8}{2 \times \sin 30}=19.6 m / s$

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