Phy 201
Your 'cq_1_7.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** **
A ball falls freely from rest at a height of 2 meters. Observations indicate that the ball reaches the ground in .64 seconds.
• Based on this information what is its acceleration?
answer/question/discussion: ->->->->->->->->->->->-> : The ball travels 2 m in .64 seconds. This means that its velocity is .34m/sec. Assuming that the object is in free fall, we would say the acceleration is the acceleration of gravity or 9.8m/sec^2. If this were the case, the final velocity of the object would be 6.27m/sec. The initial velocity would be 0 and the average velocity would be 3.13m/sec. Dividing 2 by .64 gives an average velocity of 3.13 as well.
• Is this consistent with an observation which concludes that a ball dropped from a height of 5 meters reaches the ground in 1.05 seconds?
answer/question/discussion: ->->->->->->->->->->->-> : Assuming that the initial velocity is 0, we can find the final velocity by first finding the average velocity. The objects average velocity was 5/1.05 or 4.76m/sec. We can multiply this by 2 to find the final velocity of 9.52m/sec. We can then find acceleration by taking the difference in the initial and final velocity and dividing it by the time interval. This would be 9.52/1.05 which gives 9.07.
• Are these observations consistent with the accepted value of the acceleration of gravity, which is 9.8 m / s^2?
answer/question/discussion: ->->->->->->->->->->->-> : Yes, the acceleration of gravity would exist if there was no resistance so even though the acceleration in the second problem is a bit slower, it is okay because there could be resistance.
** **
15 mins
** **
&#Very good responses. Let me know if you have questions. &#