A body of mass 1 ,kg is projected from ground at an angle 30^{circ} with horizontal on a level groun

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3-2.Motion in Plane

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A body of mass $1 \,kg$ is projected from ground at an angle $30^{\circ}$ with horizontal on a level ground at a speed $50 \,m / s$. The magnitude of change in momentum of the body during its flight is ....... $kg ms ^{-1}$ $\left(g=10 \,m / s ^2\right)$

A

$50$

B

$100$

C

$25$

D

$0$

Solution

(a)

$\Rightarrow$ The change in momentum $=-2 m u \sin \theta \hat{j}$

$\mid\Delta \vec{p} \mid=2 m u \sin \theta$

$=2 \times 1 \times 50 \times \sin 30^{\circ}$

$|\Delta \vec{p}|=50 \,Kg ms ^{-1}$

Standard 11

Physics

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