$解：?(1)f=0.1G=0.1×2.5×10^4\ \text {N}=2.5×10^3\ \text {N}?$
$? (2)s_{ }=v_{ } t_{ }={ 10 }\ \text {m/s}×{ \frac {36}{3.6} }\ \text {s}={ 100 }\ \text {m}?$
$? W=Fs={ 2.5×10^3 }\ \text{N}×{ 100 }\ \text{m}={ 2.5×10^5 }\ \text{J}?$
$? (3)F_{ }=\frac{P_{ }}{v_{ }}=\frac{{ 90×10^3 }\ \text {W}}{{ \frac {90}{3.6} }\ \text {m/s}}={ 3.6×10^3 }\ \text {N}?$
$? G_總=10F=3.6×10^4\ \text {N}?$
$? G_貨=G_總-G=3.6×10^4\ \text {N}-2.5×10^4\ \text {N}=1.1×10^4\ \text {N}?$
