A particle is projected at an angle of 600 above the horizontal with a speed of 10 m/s. After some time the direction of its velocity makes an angle of 30° above the horizontal. The speed of the particle at this instant is
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a
53m/s
b
53m/s
c
5 m/s
d
103m/s
answer is D.
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Detailed Solution
v cos30° = 10cos60°[As horizontal component of velocity remains unchanged]⇒v=103m/s