Physics Review QuestionUnit:
mechanicsYear:
1989 Question#:
10Question:
An object near the surface of planet x falls freely from rest and reaches a speed
of 12.0 meters per second after it has fallen 14.4 meters. What is the acceleration
due to gravity on planet x ?(1
) 2.50 m/s^{2}(2
) 5.00m/s^{2}
(3
) 9.80 m/s^{2}(4
) 10.0 m/s^{2}What is this question really asking?
Explanation by: John D [ Return to question menu
]Answer 1
2.50 m/s ^{2}INCORRECT Try using Vf ^{2}=Vi^{2} + 2as
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Answer 2
5.00 m/s ^{2}CORRECT Using Vf ^{2}=Vi^{2}+2as, you can plug in the final velocity (12m/s) and the displacement wich is 14.4
meters to find the acceleration.
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Answer 3
9.80m/s ^{2}INCORRECT That's the acceleration due to gravity on Earth! Check math and be sure to use Vf ^{2}= Vi^{2} +2as correctly.
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Answer 4
10.0 m/s ^{2}INCORRECT Make sure to check for math errors, make sure you are using the formula given to you above properly. return to top
What's this question really asking?
How much has planet x accelerated from Vi, which is om/s; to its final distance which is 14.4 meters? return to top |

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