A girl pushes a sled and the sled accelerates what newtons law is this a example of

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.

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?