Answer:
the "acceleration" is -15m/s (it's negative because it is slowing down, not speeding up[it might just be a positive 15m/s if it is called deceleration and not acceleration])
Step-by-step explanation:
30m/s (starting speed)/2 (the number of seconds it took to stop from 30m/s
Put the negative exponent as the denominator in a fraction, so you'd get -7/1
Number two should correspond for the graphs, with graph paper, just follow the color coded lines. Hope this helps.
0.143 filling in 20 characters