Another question on 'retarding force'

[Sanosuke Sagara]

I have question to ask on retarding force and I just can't figure out the answer.

The question is in my attachment.


In the attachment,I didn't write out my solution because I totally blure with the question ask.

I hope that someone will help me by explain to me what the question want and some information on this question.I hope somebody will suggest me which website can I refer to but not solve the question for me.Thank you !

[vsage]

Write down everything you're given. How does the retarding force relate to gravity if the speed is constant? Given the kinetic energy is 1/2 m*v^2, I think you can use simple substitution to get your answer.

[CartoonKid]

The word 'steady v' is the crucial key to your final answer.