A 0.14-kg pinecone falls 16 m to the ground, where it lands with a speed of 13

Question:

A 0.14-kg pinecone falls 16 m to the ground, where it lands with a speed of 13 m/s.
(a) With what speed would the pinecone have landed if there had been no air resistance?
(b) Did air resistance do positive work, negative work, or zero work on the pinecone? Explain.