Physics

Problem

Consider the velocity vector

v(t)=\langle 5\cos 2t,\;5\sin 2t\rangle

for

t\ge 0

. Which of the following statements is true about the particle’s speed? a) The speed is constant and equals

10

. b) The speed varies between

0

and

5

. c) The speed is constant and equals

5

. d) The speed is constant and equals

5\sqrt{2}