Classify the following measurements as vector or scalar quantities: 2.35 m, up
4.2 s
6.8 cm2
7.3 km/s, 30° N of E

Vector, scalar, scalar, vector

Explanation:

When you see a measurement followed by a direction ( up, down, north, east, etc.), it is usually a vector quantities

When you see a plain measurement such as 4.2s, 6 ft, it is usually a scalar one.

answer: option c.

explanation:

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me