Two girls are sitting on the edge of a building tossing coins over the edge. Alice is actually dropping her coins, each of which is 10 g. Barbara is tossing her coins horizontally at 0.3 m/s, and her coins are 40 g each. (See figure.) (Ignore air resistance.)
Just before Alice's coin reaches the ground, it has speed sA. Just before Barbara's coin reaches the ground, it has speed sB. How does sA compare with sB?