Question

A brick with a mass of 6kg is dropped vertically from a certain height.it takes 4,5 seconds for the brick to reach the ground.determine the ff.the height from which the brick is dropped and potential energy of the brick
h = 0.5g*t^2 = 4.9*4.5^2 = 99.23 m.

PE = mg*h = 6*9.8 * 99.23 = 5834 J.
Where did the 0.5 come from

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