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A projectile is fired with a speed u at ...

A projectile is fired with a speed `u` at an angle `theta` with the horizontal. Find its speed when its direction of motion makes an angle `alpha` with the horizontal.

Text Solution

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Let the speed be v when it makes an angle `alpha` with the horizontal. As the component of velocity remains constant,
`v cos alpha = u costheta`
`v=u cos theta sec alpha`.
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