- A body is projected with a velocity v0 at an angle θ then its horizontal velocity becomes v0 cos θ and vertical velocity becomes v0 sin θ
- At certain point, it is given that the velocity makes angle β with vertical
let the velocity at that point be 'v' then the horizontal velocity becomes vsinβ
vertical velocity becomes vcosβ
In a projectile, horizontal velocity is always constant as the acceleration in that direction is 0
so, v0 cos θ = vsinβ
v = v0 cos θ/sinβ