The Site from Which an Airplane Takes Off Is the Origin.The

Multiple Choice

The site from which an airplane takes off is the origin.The x axis points east;the y axis points straight up.The position and velocity vectors of the plane at a later time are given by $\overrightarrow { \mathbf { r } } = \left( 1.61 \times 10 ^ { 6 } \hat { \mathbf { i } } + 3.00 \times 10 ^ { 3 } \tilde { \mathbf { j } } \right) \mathrm { m }$ and $\overrightarrow { \mathbf { v } } = + ( 150 \hat { \mathbf { i } } - 21 \hat { \mathbf { j } } ) \frac { \mathrm { m } } { \mathrm { s } }$ . The plane is most likely

A) just touching down.
B) in level flight in the air.
C) ascending.
D) descending.
E) taking off.