Five ways to calculate speed without speedometer

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.

Aphysical change is a change in the size, shape,, or stafe of matter true or false

What object a collides with object b and bounces back its final momentum is?