a ball is throw vertically upwards witha speed of 20m/s from the top of the tower it reaches the earth in 8 seconds. Find the height of the tower. (take g=10mv^-2)
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Multiply the height by 2, and divide the result by the object's acceleration due to gravity. If the object fell from 5 m, the equation would look like this: (2*5 m)/(9.8 m/s^2) =1.02 s^2. Take the square root of the result to calculate the time it takes for the object to drop.
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