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3-2.Motion in Plane
hard
If at any point on the path of a projectile its velocity is $u$ at inclination $\alpha$ then it will move at right angles to former direction after time
A
$\frac{u}{g \cos ec \alpha}$
B
$\frac{u}{g \sin \alpha}$
C
$\frac{u}{g \cos \alpha}$
D
$\frac{u}{g \sec \alpha}$
Solution
$\mathrm{V} \sin \theta=u \cos \alpha$
$V=u \cot \alpha$
$-V \cos \alpha=u \sin \alpha-g t$
$g t=\frac{u}{\sin \alpha}$
Standard 11
Physics
