A projectile is fired at $30^{\circ}$ to the horizontal, The vertical component of its velocity is $80 \;ms ^{-1}$, Its time flight is $T$. What will be the velocity of projectile at $t =\frac{ T }{2}$?
A projectile is fired at $30^{\circ}$ to the horizontal, The vertical component of its velocity is $80 \;ms ^{-1}$, Its time flight is $T$. What will be the velocity of projectile at $t =\frac{ T }{2}$?
- A
$80\, ms^{-1}$
- B
$80\sqrt 3 ms^{-1}$
- C
$(80/\sqrt 3 ) ms^{-1}$
- D
$40\, ms^{-1}$
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