The vertical height y and horizontal distance x of a projectile on a certain planet are given by
x=(31)m, y=(4t-6t) m where tis in seconds. Find the speed of projection (in m/s).

The vertical height y and horizontal distance x of a projectile on a certain planet are given by
x=(31)m, y=(4t-6t) m where tis in seconds. Find the speed of projection (in m/s).