$$F_{net} =F_{gravity} + F_{air}$$
$$F_{net} =(1,4 \text{ kg})(9,8 \text{ m/s}^2) + (-2,5 \text{ N})$$
$$F_{net} =13,72 \text{ N} - 2,5 \text{ N}$$
$$F_{net} =11,22 \text{ N}$$
Ifølge Newtons anden lov:
$$F_{net} =ma$$
Derfor er genstandens acceleration:
$$a =\frac{F_{net}}{m}$$
$$a =\frac{ 11.22 \text{ N}}{1.4 \text{ kg}}$$
$$a =8,014 \text{ m/s}^2$$
Gjenstandens acceleration er 8,014 m/s^2 nedad.