7. find the direction and magnitude of the vectors
a. x=(5.0 m) î + (-2.0 m) î
b. b=(-2.0 m) î + (5.0 m) ſ and
c. åt b
8. find the direction and magnitude of the vectors
a. a = (25 m) î + (-12.0 m) ſ

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?

Abatter hits a 0.140-kg baseball that was approaching him at 30 m/s and, as a result, the ball leaves the bat at 40 m/s in the reverse of its original direction. the ball remains in contact with the bat for 2.0 ms. what is the magnitude of the average force exerted by the bat on the ball?

Which of hubble’s discovery support the big bang theory