Usage patterns
〈物〉が速度を上げるfor something to increase speed
The car sped up after passing the curve.
速度を落とすto slow down; reduce speed
The driver slowed down before the intersection.
速度を測るto measure the speed of something
The police measured the car's speed with radar.
〈数〉の速度で〈動詞〉to do something at a speed of ...
The train ran at a speed of 120 km/h.
速度が出るfor something to reach a high speed
This motorcycle can surprisingly go quite fast.