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Question

# Assertion :When range of a projectile is maximum, its angle of projection may be 450 or 1350. Reason: Horizontal range R=u2sin2θg is same, when θ=450 or 1350.

A
Both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
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B
Both Assertion and Reason are true, but Reason is not correct explanation of the Assertion.
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C
Assertion is true, but the Reason is false.
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D
Assertion is false, but the Reason is true.
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Solution

## The correct option is B Both Assertion and Reason are true, but Reason is not correct explanation of the Assertion.Horizontal range, sx in a projectile is given as:sx=u2sin2θg (u→ initial velocity )Clearly sx is maximum when |sin2θ|=1⇒θ=450 or 1350Hence assertion is correct and reason both are correct.

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