cq_1_81

Phy 231

Your 'cq_1_8.1' 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 is tossed upward with an initial velocity of 25 meters / second. Assume that the acceleration of gravity is 10 m/s^2 downward.

• What will be the velocity of the ball after one second?

Velocity of the ball after one second would be 15 m/s.

answer/question/discussion: ->->->->->->->->->->->-> :

• What will be its velocity at the end of two seconds?

After two seconds, the ball's velocity would be 5 m/s.

answer/question/discussion: ->->->->->->->->->->->-> :

• During the first two seconds, what therefore is its average velocity?

During two seconds, its average velocity is 15 m/s.

answer/question/discussion: ->->->->->->->->->->->-> :

• How far does it therefore rise in the first two seconds?

It therefore travels 30 meters in two seconds.

answer/question/discussion: ->->->->->->->->->->->-> :

• What will be its velocity at the end of a additional second, and at the end of one more additional second?

At three seconds, its velocity will be -5 m/s. At four seconds, its velocity will be -15 m/s.

answer/question/discussion: ->->->->->->->->->->->-> :

• At what instant does the ball reach its maximum height, and how high has it risen by that instant?

The ball reaches its maximum height at 2.5 seconds. It has risen 31.25 meters at that instant.

answer/question/discussion: ->->->->->->->->->->->-> :

• What is its average velocity for the first four seconds, and how high is it at the end of the fourth second?

Its average velocity for the first four seconds is 5 m/s. It will be at height 20 meters at this time.

answer/question/discussion: ->->->->->->->->->->->-> :

• How high will it be at the end of the sixth second?

The ball will be at ground level by this time.

answer/question/discussion: ->->->->->->->->->->->-> :

** **

25 minutes

** **

&#See the link provided below. However, unless you have questions or additional comments, you may ignore the request for a revision.

&#

&#Please compare your solutions with the expanded discussion at the link

Solution

Self-critique your solutions, if this is necessary, according to the usual criteria. Insert any revisions, questions, etc. into a copy of this posted document. Mark any insertions with &&&& so they can be easily identified. &#