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Find the velocity of a projectile at the...

Find the velocity of a projectile at the highest point, if it is projected with a speed ` 15 m s^(-1)` in the direction `45^(@)` above horizontla. (take g = ` 10 m s^(-2))`

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The correct Answer is:
`(15)/(sqrt(2)) m.s^(-1)` along horizontal
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