The Mars rover Spirit races across a flat plain, with position vector given by r(t) = (-2t² + 10t + 5)2 + 4tj where t is the

Question

The Mars rover Spirit races across a flat plain, with position vector given by
r(t) = (-2t² + 10t + 5)2 + 4tj
where t is the time in seconds and units on the numbers are such that the resulting position components are in meters. To 3 place precision, what is the speed of the rover at t = 2 s?
A. 3.00 m/s
B. 7.21 m/s
C. 2.27 m/s
D. 4.47 m/s
E. can't be determined from the given information.

Kunduz · Accepted Answer

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