A girl runs 120m due north in 15s. she then runs 80m due east in 12s. What is average speed?

How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

Diverging mirrors and lenses always produce images