Please solve the following 3 questions.

If a rock is thrown into the air on small planet with a velocity of 26 m/s, its height (in meters) after t seconds is given by y = 26t 4.9t2. Find the velocity of the rock When t = 4. If an arrow is shot straight upward on the moon with a velocity of 55 m/s, its height (in meters) after t seconds is given by s(t) = 551: 0.83252. What is the velocity of the arrow (in m/s) after 9 seconds? A After how many seconds will the arrow hit the moon? f, With what velocity (in rn/s) will the arrow hit the moon? i, The displacement (in meters) of a particle moving in a straight line is given by s = 3253 Where t is measured in seconds. Find the average velocity of the particle over the time interval [87 11]. Find the (instantaneous) velocity of the particle when t = 8