Answer:
Observation- The action or process of observing something or someone carefully or in order to gain information.
Hypothesis-a proposed explanation made on the basis of limited evidence as a starting point for further investigation.
Explanation:
It shows that acceleration of particle M is directly proportional to its displacement and its direction is opposite to that of displament. Thus particle M performs simple harmonic motion but M is projection of particle performing U.C.M. hence S.H.M. is projection of U.C.M. along a diameter, of circle.
It is considered parts of the Hydrosphere because water condenses in clouds and falls as precipitation so it is a vital part of the hydrosphere.
acceleration of car is 1.8 m/s^2
time = 14 s
initial speed = 14 m/s
so the final speed is calculated by



so the total distance moved in this interval of time is



now the average speed is given as



so the average speed will be 26.6 m/s