2-14

a)

b)
x=v_0t+\frac{1}{2}at^2
x=5{,}5\ \frac{m}{s}\cdot9s+\frac{1}{2}\cdot\left(-0{,}6\ \frac{m}{s^2}\right)\cdot9^2s
x=49{,}5m-24{,}3m=25{,}2m