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Question: A ball is projected with velocity u at an angle a with horizontal plane. Its speed when it makes an ...

A ball is projected with velocity u at an angle a with horizontal plane. Its speed when it makes an angle b with the horizontal is –

A

ucosα\alpha

B

ucos⁡β\frac{u}{\cos\beta}

C

u cosα\alphacosβ\beta

D

ucos⁡αcos⁡β\frac{u\cos\alpha}{\cos\beta}

Answer

ucos⁡αcos⁡β\frac{u\cos\alpha}{\cos\beta}

Explanation

Solution

V cos b = u cos a

V = ucos⁡αcos⁡β\frac{u\cos\alpha}{\cos\beta}