A car increases its speed from 20 km/s to 50 km / h in 10 seconds what its is acceleration?

0.8 m/s²

Explanation:

Convert km/h to m/s:

20 km/h * (1000 m / km) * (1 h / 3600 s) = 5.56 m/s

50 km/h * (1000 m / km) * (1 h / 3600 s) = 13.89 m/s

Acceleration is change in velocity over change in time:

a = Δv / Δt

a = (13.89 m/s - 5.56 m/s) / 10 s

a = 0.83 m/s²

Rounded to one significant figure, the car accelerates at 0.8 m/s².