A boy on a skate board skates off a horizontal bench at a velocity of 10 m/s. One tenth of a second after he leaves the bench, to two significant figures, the magnitudes of his velocity and acceleration are:
A. 10 m/s; 9.8 m/s2.
B. 9.0 m/s; 9.8 m/s2.
C. 9.0 m/s; 9.0 m/s2.
D. 1.0 m/s; 9.0 m/s2.
E. 1.0 m/s; 9.8 m/s2.
Answer: A
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