Answer:

t = 14.6 seconds

personal answer, please correct if its wrong (๑•﹏•)

Step-by-step explanation:

GIVEN:

initial velocity (vi) = 82 m/s

final velocity (vf) = 0m/s

acceleration = 5.6m/s

from equation

a = vf-vi /t , we can manipulate into

t = vf + vi /a

substitute the given to the equation.

t = 0m/s + 82m/s/ 5.6m/s²

t = - 14.6 seconds