An object undergoes a displacement while being acted on by a constant net force directed to the north. the work done on this object by the force is positive during the displacement. which statement is necessarily true about the average velocity of the object during the displacement?

Will you chech and finish these for me, because i am stumped with them.

Your target variable is δf, the magnitude of the difference in frequency between the waves emitted from the sonar device and the waves received by the device after reflecting off the whale. write an expression for δf in terms of the relevant frequencies using the subscript notation introduced above.

The pressure proportional to the area a- inversely b- directly c- increase d-decrease