)you and your lab partners do a similar experiment and find a value for the speed of sound to be 320±14 m/s. you look in a dusty old physics book and find that the speed of sound was measured a hundred years ago to be 346±2 m/s for similar experimental conditions. which of the following conclusions best describes the comparison between your result and the result in the book?

answer; i believe that the correct answer is (department   of highway safety and motor vehicles);

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.