Question

A projectile is shot from the ground at a velocity of `18 m/s` and at an angle of `(pi)/2`. How long will it take for the projectile to land?

Answer 1

An angle of `pi/2` would mean `90^o` or straight up.

Explanation:

As the acceleration/deceleration of gravity `g=9.81m//s^2`, the projectile wil have a velocity of `v=0` after:

`18/9.81~~1.835s`

The fall back will take the same time, for a total of `~~3.770s`(disregarding air resistance, of course).