Which sentence best describes the runner whose velocity-time graph is shown here? The runner ran forward for 2 seconds, and then backward for 2 more seconds.

The runner ran forward for 4 seconds - slowly for the first 2 seconds, then faster for the last 2 seconds.

The runner ran forward for 4 seconds - fast for the first 2 seconds, then more slowly for the last 2 seconds.

The runner stood still for 2 seconds, then moved suddenly, and then stood still again for 2 more seconds.

Which sound characteristic is not affected by the relative motion of an object

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.

Slab pull” is a type of tectonic plate movement that occurs due to the forces of mantle convection and results in the subduction of the lithosphere true or false