A tennis player tosses a tennis ball straight up and then catches it after 1.28 s at the same height as the point of releas (a) What is the acceleration of the ball while it is in flight? magnitude direction m/s2 --Select-- (b) What is the velocity of the ball when it reaches its maximum height? magnitude direction m/s -Select--- (c) Find the initial velocity of the ball m/s upward (d) Find the maximum height it reaches.

Question 3 Consider an object with acceleration a = 20.0 m/s² ¤ – 7. 81 m/s² ŷ . Is the horizontal component of instantaneous velocity constant. yes no Question 4 For projectile motion, the horizontal component of instantaneous velocity is constant. True False

- 5) Ajet plane is flying at constant altitude At time t,=0, it has components of velocity Vx=90 m/s and vy=110 m/s. At time t2=30 s, the components are v,=-170 m/s and Vy=40 m/s. For this time interval, a) find the components of the average acceleration. b) find the magnitude and direction of the average acceleration.

a) a projectile motion can be viewed as two one-dimensional motions,  what are these two one-dimensional motions ? b) Why in a projectile motion, along the horizontal direction, the motion can be viewed as an uniform motion?

If you fire a projectile at various speeds, does this change the time that the projectile is in the air? Explain why or why not?