1.[lpt] 20 15 10 5 10 0 2 10 Time (sec) The graph shows the velocity of a ball t

Question

1.[lpt] 20 15 10 5 10 0 2 10 Time (sec) The graph shows the velocity of a ball thrown up with an initial speed of 27.0 m/s from the surface of Mars. Evaluate the magnitude of the acceleration of gravity on Mars Answer: Not yet correct, tries 3/6 Hint: the acceleration due to gravity is the rate of change of velocity. By the way, remember that "magnitude" means your answer must be a positive acceleration! Submit All Answers 2. [lpt] For the graph above, select ALL correct answers, i.e., B, AC, BCI A) The acceleration is constant B) The ball's acceleration changes sign during its motion. C) Maximum height is reached at about t=7.3s D) The ball's speed increases during the first second E) v and g are in the same direction after t= 7.3s F) The acceleration is 0 near t= 7.3s Answer: Not yet correct, tries 1/6 Submit All Answers Hint: Giancoli P. 36, Example 2-14 discusses some common misconceptions regarding concent acceleration o a thrown object.

Explanation / Answer

1. Acceleration = Change in velocity/time taken

=(Vf-Vi)/(Tf-Ti)

=(-10-(27))/(10-0)

=-3.7 m/s^2

2.

A) Correct- Since the change in velocity graph is straight line hence acceleration is constant

B) Incorrect - As Acceleration is constant, it does not change sign

C) Correct - At max height V=0 which comes at t=7.3 s

D) Incorrect

E) Correct

F) Incorrect

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