Remember to think about what you are given

and what is happening in the problem to pick

a coordinate system.

1

A radar is tracking a rocket.

At some instant of time, the distance,

r, and angle, 0, are measured as 10 mi

and 30°, respectively. From successive

measurements, the derivatives, r, , 0,

..

and are estimated to be 650 ft/s,

2

2

165 ft/s, 0.031 rad/s, and 0.005 rad/s,

respectively. Determine the velocity

and acceleration of the rocket.