Question

If a body projected with a velocity 30m/s, making an angle of 30° with horizontal
Then the time of flight is? (g=10m/s)
(A) 4s
(B) 5s
(C) 2s
(D) 3s​

Answer 1

Answer:

4s

Explanation:

Answer 2

Answer

( D ) 3 sec

Given

• A body projected with a velocity 30 m/s, making an angle of 30° with horizontal

To Find

• Time of flight

Solution

We know that ,

Time of flight ,

$\bf T=\dfrac{2u.sin\theta}{g}\\\\\implies \bf T=\dfrac{2\times 30 \times sin30}{10}\\\\\implies \bf T=2 \times 3 \times \dfrac{1}{2}\\\\\implies \bf T=3\ sec$

More Info

$\bf s=ut+\dfrac{1}{2}at^2\\\\\implies \bf 0=usin \theta .T-\dfrac{1}{2}gT^2\\\\\implies \bf u sin \theta T=\dfrac{gT^2}{2}\\\\\implies \bf T=\dfrac{2u.sin \theta}{g}$