A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two-second time. The acceleration of the ball in m/s2 is
a. 0.
b. 4.9.
c. 9.8.
d. 19.6.
e. none of these.
c
Physics & Space Science
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