Air sample of places around the world compared to clean air
Answer:
In a collision, the velocity change is always computed by subtracting the initial velocity value from the final velocity value. If an object is moving in one direction before a collision and rebounds or somehow changes direction, then its velocity after the collision has the opposite direction as before.
Answer:
Contour line, a line on a map representing an imaginary line on the land surface, all points of which are at the same elevation above a datum plane, usually mean sea level. The diagram illustrates how contour lines show relief by joining points of equal elevation. Encyclopædia Britannica, Inc. Video Player is loading.
Since the acceleration of car is uniform so the distance traveled by car while brakes are applied is given by

given that



now plug in all data in above formula


so car will cover 14.4 m distance while it apply brakes
Answer:
The speed of the object at the lowest point in its trajectory is:

Explanation:
We can use the conservation of energy between the maximum point of swing and the lowest point of the pendulum.

(1)
Where:
- h is the height of the object at 30° with the vertical.
- v is the speed at the lowest point.
We can find h using trigonometry.


Now, using equation (1) we can find v.


I hope it helps you!