Answer
Acceleration = -20.6g
Work Step by Step
Given:
$V_{o}$ = 1020km/hr = 283.33 m/s
time = 1.4s
What we know:
$V_{f}$ = 0
1g = 9.8m/$s^{2}$
Use the equation: Acceleration = $\frac{V_{f}-V_{o}}{t}$
Acceleration = $\frac{0m/s^{2}-283.33m/s^{2}}{1.4 seconds}$
Acceleration = -202.3m/$s^{2}$
To find the answer in terms of g:
Acceleration = $\frac{(-283.33m/s^{2})(1g)}{9.8m/s^{2}}$
Acceleration = -20.6g