Question

Please try to answer all questions and show work. Thank you.

1. A baseball player is warming up and tosses a ball straight up into the air. The ball travels up until it reaches some maximum height, and then falls back down to the player's hand. If we neglect air resistance, then the magnitude of the acceleration of the ball is? A. largest the moment after it leaves the players hand. B. smallgst the moment after it leaves the player's hand. C. largest the moment before it returns to the player's hand. D. smallest the moment before it returns to the player's hand. E. largest when it reaches the highest point. F. smallest when it reaches the highest point. G. constant at all points in its flight. 2. An object is tracked in the following position vs time graph. a. At which point(s) is the object moving the fastest? b. At which point(s) is the object not moving? Time

Answer 1

a = g = 9.8 m/s^2 (a) Constant at all points in its flight. v = dx/dt = slope (a) Slope at (D) is greatest. So, it is moving fast at (D). (b) At point (E) it is not moving. (slope = 0)