Keeping the speed of projection constant...

Keeping the speed of projection constant, the angle of projection is increased from `0^(@)` to `90^(@)`. Then the horizontal range of the projectile

increases up to `45^@` and decreases afterwards

increases up to `60^@` and decreases later

increases up to `45^@` and remains unaltered thereafter

goes on increasing up to `90^@`

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