P6. in step 4 of the csma/ca protocol, a station that successfully transmits a frame begins the csma/ca protocol for a second frame at step 2, rather than at step 1. what rationale might the designers of csma/ca have had in mind by having such a station not transmit the second frame immediately (if the channel is sensed idle)?

only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.