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  4. A projectile is thrown with initial velocity v0 and angle 30° with the horizontal. If it remains in the air for 1 s, what was its initial velocity?

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Q. A projectile is thrown with initial velocity $v_{0}$ and angle $30^{\circ}$ with the horizontal. If it remains in the air for $1\, s$, what was its initial velocity?

J & K CETJ & K CET 2013Motion in a Plane

Solution:

Time of flight $T=\frac{2 u \sin \theta}{g}$
Given, $u=v_{0},\, T=1\, s,$
$\theta=30^{\circ}, g=9.8\, m / s ^{2}$
$v_{0}=u=g=9.8\, m / s$