The speed in case a is twice that of case b. the circles radius in case a is two times that of case b. how does the acceleration in case a compare to the acceleration in case b?

acceleration of a is twice the acceleration of b.

Explanation:

va = 2v

vb = v

ra = 2r

rb = r

Acceleration is given by

So, acceleration of a is given by

....(1)

acceleration of b is given by

.... (2)

dividing (1) by (2), we get

Thus, acceleration of a is twice the acceleration of b.

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)

a is the best answer your welcome