James throw a ball from the root of a building. The ball fell 3 feet in the first second, 9 feet in the next second, and 27 feet
in the third second. Which expression represents the distance the ball fell at the nth second?
1 answer:
D=1/2.g.t^2,
where D=distance the object has fallen, g=9.81m/sec^2(being the pull of gravity), t=time elapsed in seconds.
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