Which of the following is true about the position versus time graph of an object that comes to a stop, then remains at rest?
a. there is no change in slope.
c. the slope changes from positive to negative.
b. the slope changes to zero.
d. none of the above.

b its b bro

Explanation:

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.