Abobsled has a momentum of 1500 kg*m/s to the south. air resistance reduces its momentum to 750 kg*m/s to the south. what impulse is applied to the bobsled by the air resistance?

Anton created a chart listing different types of materials. which best complete the chart? (a)x: copper y: glass(b)x: rubber y: copper(c)x: paper y: silicon(d)x: silicon y: glass

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.

Can anybody me with this? ? (picture included.)