Question

Give derivation of formulae of Time of Flight

Answer 1

The displacement in vertical direction (y-axis) becomes zero in whole time T , so we have

y = ut+1/2at^2

0=ut+1/2at^2

which gives

T= 2u/g =
$\frac{2u \sin( \alpha ) }{g}$
this is the formulae of Time of flight

Answer 2

$\textbf{Answer is in Attachment !}$