This is in Differential Calculus. This is only multiple choice. Provide necessary solution for each items. Thank you and Godbless. Follow the numbering.

19. A light is placed on a horizontal ground 40 ft from a building. A man 6 ft tall walks from the light toward the building at a rate of 5 fts. Find the rate at which his shadow on the building is decreasing when he is 16 ft from the building. A) 2.896 fu's C) 2.083 fu/'s B) 2.333 ft/s D) 2.667 fu/'s 20. A light hangs 20 ft above a street. A ball, 10 ft horizontally from the light and 20 ft above the street, is dropped. How fast is the shadow of the ball on the street moving after 1 second? From free-falling kinematics, the distance y traveled by the ball is given by y = 16. light ball 10 ft ball at any 20 ft time A) 11.5 ft/'s ) 12.5 fus B) 10.5 ft/s D) 13.5 fu/'s