An object of mass 1 kg is thrown downwards from a height of 20 m. The initial speed of the object is

An object of mass 1 kg is thrown downwards from a height of 20 m.
The initial speed of the object is 6 m/s.
The object hits the ground at a speed of 20 m/s. Assume g= 10 m/s2
. What is the best estimate of the energy transferred
from the object to the air as it falls?