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Final answer:The height of the cliff from which the ball is thrown can be calculated using the formula for vertical displacement in motion, h = 0.5*g*t^2. Substituting the given values, the height of the cliff is approximately 78.4 meters.Explanation:In Physics, the height from which a projectile is dropped can be calculated using the simple formula for vertical displacement in motion, which is. Here, g represents the acceleration due to gravity which is approximately 9.8 m/s^2, and t represents the time the object is in motion.So for your question, where you have a ball thrown horizontally from a cliff and the ball hits the ground after 4 seconds, we would substitute 4 for t. The calculation becomesh =meters.As such, the height of the cliff is approximately78.4 meters.Learn more about Projectile Motion here:brainly.com/question/20627626#SPJ3...

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