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## Homework Statement

A ball is thrown horizontally with speed u from a height of 20m. It hits the ground with a speed 3u. Find the value of u, and the angle at which the ball strikes the ground.

## Homework Equations

The equations of motion.

## The Attempt at a Solution

I know that I must deal separately with the horizontal and vertical components of the motion.

I have worked out that the final vertical velocity will be 19.8m/s but I don't where to go next to find u.