His running speed is astonishing.

What number did you arrive at?

We have a responsibility to make this world a better place.

He treats us as a big friend.

When an object is in free fall, its terminal velocity is determined by the balance between gravity and air resistance.

What is the initial velocity of this object?

He looked at the speedometer and checked the speed of the car.

He caught the ball with a swift movement.

Surprised by the sudden heavy rain, I forgot my umbrella.

He has acquired the skill of speedreading, allowing him to read many books.