A ball is thrown into the air by a baby alien on a planet in the system of Alpha Centauri with a velocity of 43 ft/s. Its height in feet after t seconds is given by y = 43 t − 15^2. Find the average velocity over the time interval [2,2+h] where h is given as follows: h=0.1 h=0.01 h=0.001 Estimate the instantaneous velocity when t=2

Which of the following are properties of mechanical waves? check all that apply ⭕️ particles of the medium move back and fourth, but do not move with the wave. ⭕️ the particles of the medium always move parallel to the wave motion. ⭕️ wave motion begins with a disturbance in the medium. ⭕️ waves transport energy from a source outward, away from the source.

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Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2