#$&*
PHY 121
Your 'cq_1_08.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** **
A ball is tossed upward with an initial velocity of 25 meters / second. Assume that the acceleration of gravity is 10 m/s^2 downward.
What will be the velocity of the ball after one second?
answer/question/discussion: ->->->->->->->->->->->-> :
The velocity of the ball will be 15m/s after one second.
#$&*
What will be its velocity at the end of two seconds?
answer/question/discussion: ->->->->->->->->->->->-> :
After two seconds, the velocity will be 5m/s.
#$&*
During the first two seconds, what therefore is its average velocity?
answer/question/discussion: ->->->->->->->->->->->-> :
The average velocity will be 15m/s.
#$&*
How far does it therefore rise in the first two seconds?
answer/question/discussion: ->->->->->->->->->->->-> :
It rises 30 meters in the first two seconds.
#$&*
What will be its velocity at the end of a additional second, and at the end of one more additional second?
answer/question/discussion: ->->->->->->->->->->->-> :
The velocity at one more second will then be -5m/s and after another will be -15m/s
#$&*
At what instant does the ball reach its maximum height, and how high has it risen by that instant?
answer/question/discussion: ->->->->->->->->->->->-> :
The ball would reach it's maximum height right before the ball changes from positive velocity to negative velocity. The height would be 37.5m.
#$&*
What is its average velocity for the first four seconds, and how high is it at the end of the fourth second?
answer/question/discussion: ->->->->->->->->->->->-> :
The average velocity after the first four seconds is 5m/s. The height is now 20m.
#$&*
How high will it be at the end of the sixth second?
answer/question/discussion: ->->->->->->->->->->->-> :
The average velocity at the 6th second would be -5m/s. TI'm not sure how to get the height though because if you multiplied -5m/s * 6s, you would get a negative. How can I get the height?
#$&*
@& The ball could be falling down a well. Negative heights are certainly possible. Your reasoning is therefore correct, and that -30 m is a perfectly good answer.*@
*#&!