a) $36km/h=10m/s$
$1'=60s$
$a=\frac{Δv}{Δt}=\frac{10-0}{60}=\frac{1}{6}(m/s^{2})$
b) $54km/h=15m/s$
$a=\frac{Δv}{Δt}=\frac{0-15}{10}=-1,5(m/s^{2})$
c) $30km/h=\frac{25}{3}m/s$
$60km/h=\frac{50}{3}m/s$
$a=\frac{Δv}{Δt}=\frac{\frac{50}{3}-\frac{25}{3}}{10}=\frac{5}{6}(m/s^{2})$