A wildebeest is running in a straight line, which we shall call the x axis, with the positive direction to
the right. The figure below shows this animal's
velocity as a function of time. (Figure 1)

Which of the following statements must be true?

A)it is moving to the left between a and b and to the right between b and c
B)it’s acceleration is increasing
C)it’s speed is decreasing from a to b and increasing from b to c
D)it is moving to the right between a and c

Which best represents the law of conservation of mass ?

The charge on a charged sphere is: a)concentrated at its centerb)distributed uniformly throughout its volumec)clustered on its centerd)distributed uniformly over its surface

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=