The perpendicular unit vectors i and j are in the horizontal plane and the unit vector k is directed vertically upwards.
Write down the first two values of t for which Tom is directly below his starting
Here is what I did:
The i and j components must be 0, so
Now I cant get a value of t in which both are 0, let alone a value for which bot are 0 and the K component is negative.
Help is highly appreciated
Edit: The MS says that the answers are t = 2pi and t= 4 pi. But putting t=2pi in gives r = 2i + 3.7k, which can't be directly below his starting position as it has moved 2 units east and 3.7 units up ?? And the same problem occurs when t=4 is put in.