Range of a projectile when launched at angle θ is same as when launched at angle 2 θ . value of θ

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3-2.Motion in Plane

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The range of a projectile when launched at angle $\theta$ is same as when launched at angle $2 \theta$. What is the value of $\theta$ ?

A

$15$

B

$30$

C

$45$

D

$60$

Solution

(b)

$2 \theta=90^{\circ}-\theta$

or $3 \theta=90^{\circ} \text { or } \theta=30^{\circ}$

Standard 11

Physics

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