Consider a ball thrown straight up. It goes up, then falls down. (Start by defin

Question

Consider a ball thrown straight up. It goes up, then falls down. (Start by defining the coordinate system. Defining the coordinate system is always required; for this question, you get to make the choice. Is up or down the positive y direction? Is left or right the positive x direction?) What is the acceleration of the ball on the way up? What is the acceleration when it reaches its highest point? Is the acceleration positive or negative? What is the acceleration of the ball on the way down? Is the acceleration positive or negative?

Explanation / Answer

the acceleration of the ball goes up is    - g.   becaus it moves against the force of gravity of the earth.so its velocity reduces and finally becomes zero    At maximum height   the velocity of the ball is   zero and as the ball travells against the force of gravity of earth     acceleration is   a = - g the acceleration of the ball on the way down is   a = g                                                                                              

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