PhYsIcS PlEaSe HelP?

Question

A 0.06 kg pinecone falls 14.7 m to the ground, where it lands with a speed of 16 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?
---Select--- positive negative zero

Answer 1

Oh for pitys sake!!
v = √(2ah) so go calculate the speed of the pinecone with no air resistance.
Since the air resistance slowed the pine cone, what kind of work did it do? Did it add to the energy the pine cone was acquiring from the acceleration of gravity? Think about it.

Doug