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Dit : V ----> t = π/4 s ?
Peny :
r(t) = [(- 2√3 sin 2t) i + (8 cos 2t) j] m/s
t =π/4 s
V = [(- 2√3 sin 2(π/4)) i + (8 cos 2(π/4)) j]
= [(- 2√3 sin π/2) i + (8 cos π/2) j]
= [(- 2√3 (1) i + (8 (0) j]
= - 2√3 i m/s
= - 3,46 i m/s