Speed in a loop. In the figure below, a solid, uniform sphere is released from rest at height h - 3R and rolls smoothly down a straight track and into a circular loop of radius R - 14.0 cm. The release height is sufficiently high that the sphere reaches the top of the loop with some speed v. We repeat the demonstration by gradually increasing h. At what rate dvidh does v increase when h reaches the value 4R? Number 1 Units