Question:
A ball is projected with velocity u at an angle α with horizontal plane. Its speed when it makes an angle β with the horizontal is
(1) u cos α (2) u/cos β (3) u cos(3) u cos α cos β (4)u cos α/cos β
Answer:
In this case, the horizontal velocity remains the same, that is u cos α.
Let the velocity of the particle ve v m/s, when it makes the angle β.
The, vertical velocity = v cos β.
Since, horizontal velocity = vertical velocity
So, u cos α = v cos β
So, v = u cos α/cos β
Option d is correct.
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