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A projectile thrown with an initial velo...

A projectile thrown with an initial velocity of `10 ms^(-1)` at an angle a with the horizontal, has a range of 5 m . Taking `g=10 ms^(-2)` and neglecting air resistance, what will be the estimated value of `alpha` ?

A

`15^(@)`

B

`30^(@)`

C

`45^(@)`

D

`75^(@)`

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