Net External Force & Work Done: Explained & Justified

[clarkandlarry]

A sailboat is moving at a constant velocity. Is work being done by a net external force acting on the boat? Explain.

The speed of a particle doubles and then doubles again because a net external force acts on it. Does the net force do more work during the first or the second doubling? Justify your answer.

 

[G01]

Welcome to PF Clark and Larry!

This seems like a homework question, so according to the forum rules, you must show your own thoughts on the problems before anyone can help you.

Also, please post future homework problems in the appropriate Homework forums:

https://www.physicsforums.com/forumdisplay.php?f=152