For each of the following news stories, determine whether the objects speed or velocity is given: the world record for the hundred-meters dash is about 10m/s; the wind today is 30 km/h from the north-west; a 200,000 kg train was traveling north at 70 km/h when it derailed; a car was issued a ticket for traveling at 140 km/h on the interstate

the world record for the hundred-meters dash is about 10m/s --> speed

the wind today is 30 km/h from the north-west -->  velocity

a 200,000 kg train was traveling north at 70 km/h when it derailed -->  velocity

a car was issued a ticket for traveling at 140 km/h on the interstate --> speed

Explanation:

Let's remind the difference between speed and velocity first:

- The speed of an object is the ratio between the distance traveled by the object and the time taken. It is a scalar, so it has only a magnitude

- The velocity of an object is a vector whose magnitude is equal to the ratio between the displacement of the object and the time taken, and a direction given by the direction of motion. So, velocity has both magnitude and direction.

Let's analyze now each option:

the world record for the hundred-meters dash is about 10m/s --> this has only a magnitude (10 m/s), so it is a speed

the wind today is 30 km/h from the north-west --> this has both a magnitude (30 km/h) and a direction (north-west), so it is a velocity

a 200,000 kg train was traveling north at 70 km/h when it derailed --> this has both magnitude (70 km/h) and direction (north), so it is a velocity

a car was issued a ticket for traveling at 140 km/h on the interstate --> this has only a magnitude (140 km/h), so it is a speed

report!

explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."