Question

A body is projected with a velocity u at an angle of 60° to the horizontal the time interval after which it will be moving in a direction of 30° to the horizontal is

Answer 1

Answer:

Explanation:

Please find the attachment below

Answer 2

Answer:

The time is 0.037u sec.

Explanation:

Given that,

Projected angle = 60°

Moving angle =30°

We need to calculate the time

Using formula of time

$t = \dfrac{u\Delta \sin\theta}{g}$

$t=\dfrac{u\sin\theta}{g}-\dfrac{u\sin\theta}{g}$

Put the value of both angle into the formula

$t=\dfrac{u\sin60}{9.8}-\dfrac{u\sin30}{9.8}$

$t= u(\dfrac{\sin60}{9.8}-\dfrac{\sin30}{9.8})$

$t=0.037u\ sec$

Hence, The time is 0.037u sec.