Four seconds after an object is thrown down with an initial velocity of 20 M/S on planet X, it's speed is 80 M/S what is the acceleration of gravity on this planet?  Can someone walk me through solving this equation?   Thank you

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Distance and Speed

The speed, distance and time relation forms the basis of study of motion. You will need these concepts in the study of Mechanics. This concept is applicable for students who are studying the following courses –