Question

A charged particle moving with constant velocity v = v0xhat enters a region where there is a constant electric field.

For which of the conditions will
the direction of travel of the particle initially change?
the speed of the particle initially decrease?
the K.E. of the particle increase so long as it is in the region of the field?
the particle return to its initial location if the field extends far enough?

a)q is positive, and E= -E0x hat
b)q is negative, and E=-E0x hat
c)q is positive, and E =E0z hat
or none of A,B,C.