Q.

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
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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