A 50,000. Kg barge moving at 4 0 m/s in the water is being slowed to test by a ture boat that can push on the barge in the opposite direction that it is moving with an average forte of 300.0 Newtons
How long will it take the tug boat to stop the barge?

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=