A particle is projected from ground with speed 80 ,m / s at angle 30^{circ} with horizontal from gro

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3-2.Motion in Plane

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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

$0$

D

$40 \sqrt{3}$

Solution

(d)

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

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

Standard 11

Physics

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