You drag a block with constant speed v across a table with friction. Explain in detail what you have to do in order to change to a constant speed of 2v on the same surface. (That is, the puzzle is to...

You drag a block with constant speed v across a table with friction. Explain in detail what you have to do in order to change

to a constant speed of 2v on the same surface. (That is, the puzzle is to explain how it is possible to drag a block with sliding

friction at different constant speeds.)