A girl on a bridge throws a rock straight down at -12.5m/s. It hits the ground 38.4 m below. How much time did it take?

Ibelieve the answer is either b or c, but i'm leaning more towards c.hope my answer has you : )

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.

Ray 2 should cross through the focal point on the right side of the lens