1.

A projectile can have the same range 'R' for two angles of projection. If t_(1) and t_(2) be the times of flight in the two cases, then product of the two times of flights is proportional to :

Answer»

`R^(2)`
`1/R^(2)`
`1/R`
R

Solution :As RANGE for `theta` and (90° - `theta`) is the same, the times of flight are given by
`t_(1)=(2usintheta)/g` and `t_(2)=(2ucostheta)/g`
`t_(1).t_(2)=(2u^(2)sin2theta)/g=(2R)/g` or `t_(1).tpropR`


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