Question

An aeroplane is moving with horizontal velocity $u$ at height$h$. The velocity of a packet dropped from it on the earth's surface will be ($g$ is acceleration due to gravity)

• A. $\sqrt{u^{2} + 2gh}$
• B. $\sqrt{2gh}$
• C. $2gh$
• D. $\sqrt{u^{2} - 2gh}$

Answer 1

Answer: (A)

$\sqrt{u^{2} + 2gh}$

Answer 2

Horizontal velocity of dropped packet $= u$

Vertical velocity $= \sqrt{2gh}$

$\therefore$ Resultant velocity at earth

$= \sqrt{u^{2} + 2gh}$