Question

the position of a dragonfly that is flying parallel to the ground is given as a function of time by r=[2.90m+(0.0900m/s^2)t^2]i-(0.0150m/s^3)t^3j. (a) At what value of t does the velocity vector of the insect make an angle of 30.0 clockwise from the +x-axis? (b) At the time calculated in part (a), what are the magnitude and direction of the acceleration vector of the insect?

Answer 1

so tan(30) = -y / x

Answer 2

whats the deal with all the strange units :|

Answer 3

m/s^2 , guessing that's an acceleration.

what is m/s^3 for the y component. I'm fairly sure its a typo

Answer 4

nope, the text book indeed said "m/s^3" for j component of vector