Assertion: When range of a projectile is maximum , its angle of projection may be `45^(@) or 135^(@)`.
Reason: Whether `theta` is `45^(@) or 135^(@)`, value of range remains the same, only the sign changes.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false

Answer

A

Explanation

`R = (u^(2) sin 2theta)/g`
When `theta = 45^(@), R_("max") = u^(2)/g`
When `theta = 135^(@), R_("max") = -u^(2)/g`