Physics

Since the stone is thrown horizontally, its initial vertical velocity is zero. We can use the equation of motion for vertical projectile motion to find the time it takes for the stone to strike the water.

The equation of motion for vertical projectile motion is:

Vertical displacement = Initial vertical velocity * Time + (1/2) * Acceleration due to gravity * Time²

In this case, the vertical displacement is given as 80 m, the initial vertical velocity is zero, and the acceleration due to gravity is approximately 9.8 m/s².