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STD 11 - 3.2. motion in plane — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 3.2. motion in plane4 Marks
MCQ
A particle is projected from ground with speed $80 \,m / s$ at angle $30^{\circ}$ with horizontal from ground. The magnitude of average velocity of particle in time interval $t=2 \,s$ to $t=6 \,s$ is ....... $m / s$ [Take $g=10 \,m / s ^2$ ]
  • A
    $40 \sqrt{2}$
  • B
    $40$
  • C
    $0$
  • ✓
    $40 \sqrt{3}$
✓

Answer

Correct option: D.
$40 \sqrt{3}$
d
(d)

Average velocity of the projectile when it is at the same vertical height is : $u \cos \theta$.

$\Rightarrow 80 \times \cos 30^{\circ} \Rightarrow 40 \,ms ^{-1}$

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