HD Two velocities 10ms' and 15 ms' are inclined at anlangle of 60° to each other. Obtain the resultant velocity By graphical method and
by analytical method​

Stephanie lives in california, and her cousin thomas lives in france. which coordinate system would be most useful if the two wanted to observe the same meteor shower and discuss their observations over online chat as they're making them? a. horizontal b. equatorial c. azimuth-altitude d. celestial or azimuth-altitude