Question

A projectile is shot from the ground at a velocity of `7 m/s` at an angle of `(5pi)/12`. How long will it take for the projectile to land?

Answer 1

`~~1.38s`

Explanation:

velocity of projection`u=7ms^-1`
angle of projection,`alpha=5pi/12`
If time of flight be T s
then
`0=usinalphaxxT-1/2xxgxxT^2`

`=>T=(2usinalpha)/g=(2xx7xxsin(5pi/12)/9.8)~~1.38s`