The ball has travelled at a horizontal distance of 20 m. The result is obtained by using the concept of projectile motion.
A projectile motion is a motion of an object which the only force acting upon is gravity. The gravity influences the vertical motion, but not the horizontal motion. The gravity causes a vertical acceleration.
The horizontal motion has a constant velocity, so it has no acceleration and there is no horizontal forces acting on the object.
A person throws a ball at a horizontal velocity of 4 m/s. It hits the ground at exactly 5 seconds. What is the horizontal distance of the ball to hit the ground?
Since there is no horizontal force acting of the object, the horizontal distance is
dx = dVx × t
dx = 4 m/s × 5 s
dx = 20 m
Hence, the ball has travelled 20 m at the horizontal distance.
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