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Q.

A projectile is projected at 10 ms-1 by making at an angle 60° to the horizontal. After some time, its velocity makes an angle of 30° to the horizontal. Its speed at this instant is

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a

103

b

103

c

53

d

53

answer is A.

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Detailed Solution

As the velocity makes an angle of 30° with horizontal, so the horizontal component of velocity at the instant will be v cos 30°.⇒ v cos30o = 5⇒v=5cos30°=53/2=103 ms-1
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A projectile is projected at 10 ms-1 by making at an angle 60° to the horizontal. After some time, its velocity makes an angle of 30° to the horizontal. Its speed at this instant is