1.

For a given angle of projection, if the time of flight of a projectile is doubled, the horizontal range will increase to :

Answer»

four TIMES
thrice
once
twice

Solution :Here `R=(U^(2)SIN2THETA)/g` and `T=(2usintheta)/g`
Now `T^(2)=(4u^(2)SIN^(2)THETA)/(g^(2))=(2(2u^(2)sintheta.sintheta)/g^(2))`
`g t^(2)=(2u^(2)sin2theta)/g.tantheta`
`g t^(2)=Rtantheta`
As .g. and tan`theta` are constants R `prop T^(2)`
When .T. is doubled .R. becomes 4 times.


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