Answer
$N=\frac{kg\times m}{s^{2}}$
kN and pN are the most suitable.
Work Step by Step
1. $F= m\times a= \frac{m\times V}{t}=\frac{m\times l}{t^{2}}$
SI base units that force consists of are length -(m); time -(s); mass - (kg)
2. We convert speed from mph to m/s using conversion:
$1 mile = 1.6093km$
$1km=1000m$
$1h=3600s$, then
$85.5115 km/h = 88511.5 m/h = 24.5865 m/s$
3. Calculate force:
$F = \frac{10,000kg \times 24.5865 m/s}{1s}=245,865 N =245.865$ $ kN$
4. Calculate next force without conversion:
$F = \frac{10^{-20} kg \times 3 \times 10^{8} m/s}{1s}=3 \times 10^{-12} N =3$ $ pN$
