1 Pretest: Unit 2 The figure shows three displacement vectors, which are labeled a 15m west, b 2.0m east and c 7.0m east. What is the magnitude and direction of the resultant vector found by adding a and b? A 13m west B. 13m easy C. 17m west D. 17m east​

Wavelength divides in half and speed stays the same.

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

Binary fission and mitosis