Atennis ball is thrown horizontally at a speed of 10 m/s from the top of a building 78.4 meters high. how long does it take the ball to hit the street?

When it comes to horizontal projectiles, the formula for time is:



Where:
dy = vertical distance or height
g = acceleration due to gravity
t = time

Based on the problem, we know that the height at which the tennis ball was thrown is 78.4 m and the acceleration due to gravity is a constant 9.8m/s2. All you need to do is input that into our equation:






The time it would take is 4 seconds.

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