Question

A bird flies at an angle of $60^{\circ}$ to the horizontal. Its horizontal component of velocity is $10\, m\, s ^{-1}$ . Find the vertical component of velocity in $m s ^{-1}$ .

• A. $10 \sqrt 3$
• B. $\frac{10}{\sqrt{3}}$
• C. $5$
• D. $26$

Answer 1

Answer: (A)

$10 \sqrt 3$

Answer 2

$\theta=60^{\circ}, u_{x}=10\,m\,s^{-1}, u_{y}=?$
As tan $\theta=\frac{u_{y}}{u_{x}}$
$\therefore u_{y}=u_{x} tan \,\theta=10\times\sqrt{3}$
$=10\sqrt{3}\,m\,s^{-1}$