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Questions  

At what angle with the horizontal should a ball be thrown so that the range R is related to the time of flight as R=5 T2? (Take g= 10 ms-2)

a
30o
b
45o
c
60o
d
90o

detailed solution

Correct option is B

RT2=gsin2θ4sin2θ=g2cotθ=5cotθ  Given RT2=5  Hence, 5=5cotθ or θ=45°

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Assertion : When the velocity of projection of a body is made n times, its time of flight becomes n times.

Reason : Range of projectile does not depend on the initial velocity of a body.


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