9.Two people are pushing a broken down car. One pushes 2 m/s east, the other a 1.5 m/s east. Do they have the same or different velocity? why

No, they don't have the same velocity

Explanation:

Given that one person pushes the car 2 m/s east, and the other pushes the car 1.5 m/s east.

As velocity is a vector quantity, so, to have equal velocity, both magnitude as well as the direction must be equal.

For the first person:

Magnitute of the velocity = 2 m/s.

The direction of the velocity: Towards east.

For the second person:

Magnitute of the velocity = 1.5 m/s.

The direction of the velocity: Towards east.

As both the person have the same direction but the different magnitude of the velocity, so, they don't have the same velocity.

hello there!

your answer is a “generator”

a generator does not create energy but instead it transforms it.

it’s basically a motor working in reverse.

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue