1.What is a reference system? 2.What is path, road and move? 3.What is speed? 4. How is acceleration defined? 5.What is a rigid body?
6. What is the angular displacement and the described angle?
7.Angular velocity. Angular acceleration. Period and frequency.

(sorry, i had to translate these on google because idk how to translate some terms, if you know serbian, i can send you on serbian)

1. reference system - a system that uses coordinates to establish position coordinate system , frame of reference , reference frame organization , arrangement , organisation , system - an organized structure for arranging or classifying; "he changed the arrangement of the topics"; "the facts were familiar but it was in the organization of them that he was original"; "he tried to understand their system of classification"

2. Path- a way or track laid down for walking or made by continual treading. Road- a wide way leading from one place to another, especially one with a specially prepared surface which vehicles can use. Move- go in a specified direction or manner; change position.

Explanation:

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.

b. false

explanation:

suppose a rock in free fall is dropped off a cliff. after falling for 5 seconds, its speed would not be 100 m/s.