An object is thrown vetically upward with an initial velocity of 14.7 m/s.How long does it take for the object to be 9.8 m from its initial position?What is the instantaneous velocity at 9.8 m from its initial position. Explain why two answers arise.

Answer 1

IT goes up, and comes down. That is the source of two solutions.

Hf=hi+vi*t-4.9t^2

9.8=0+14.7t-4.9t^2 solve for t.