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The position of a model helicopter of weight 3.50 x 105 N under test is given...

The position of a model helicopter of weight 3.50 x 105 N under test is given in unit vector notation by ?⃗ =[(15.0??)? + (0.30 ??3)?3]?̂−(0.850 ??2)?2?̂.

a. Determine the velocity in magnitude-direction notation of the helicopter at t = 2.50 s.

b. What net force is acting on the helicopter in unit vector notation at t = 2.50 s?

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