If the displacement of an object is given in SI units by ?x = ?3t + 4t 2, at t = 2 s its velocity and acceleration are, respectively:
a. positive, positive.
b. positive, negative.
c. negative, negative.
d. negative, positive.
a
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Indicate whether the statement is true or false
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A. 6.4 N B. 5.9 N C. 5.4 N D. 6.9 N E. 8.3 N
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