A projectile is fired with a speed u at an angle θ with the horizontal. Its speed when its direction of motion makes an angle 'α' with the horizontal is
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a
usecθcosα
b
usecθsinα
c
ucosθsecα
d
usinθsecα
answer is C.
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Detailed Solution
Horizontal component of velocity remain same.ucosθ=vcosα⇒v=ucosθsecα