Vi = 54 m / s
Vf = 0
T = 15 seg
a = ?
D = ?
A = <img src="https://tex.z-dn.net/?f=%20%5Cfrac%7Bvf-vi%7D%7Bt%7D%20%20" />
a = <img src="https://tex.z-dn.net/?f=%20%5Cfrac%7B0-54%20m%2Fs%7D%7B15s%7D%20" />
a = - 3.
6m / <img src="https://tex.z-dn.net/?f=%20s%5E%7B2%7D%20" />
d = <img src="https://tex.z-dn.net/?f=%28%20%5Cfrac%7Bvi%2Bvf%7D%7B2%7D%20%29t%20" />
d = <img src="https://tex.z-dn.net/?f=%28%20%5Cfrac%7B54m%2Fs%2B%200%7D%7B2%7D%29%2015s" />
d = <img src="https://tex.z-dn.net/?f=%2827%20m%2Fs%29%2015s" />
d = <img src="https://tex.z-dn.net/?f=405%20m" />.