cq_1_021

phy 201

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seed_question_2_1

course phy 201

9/11/09 8:40 AM

A ball starts with velocity 4 cm/sec and ends with a velocity of 10 cm/sec. vvvv

• What is your best guess about the ball's average velocity?

answer/question/discussion: ->->->->->->->->->->->-> : 7cm/sec average velocity.

• Without further information, why is this just a guess?

answer/question/discussion: ->->->->->->->->->->->-> : The ball could have reached its maximum velocity halfway down the ramp, which would increase the average, but we don’t know anything else so we have to make an educated guess.

• If it takes 3 seconds to get from the first velocity to the second, then what is your best guess about how far it traveled during that time?

answer/question/discussion: ->->->->->->->->->->->-> : I believe the ball rolled 18 cm during the time interval.

• At what average rate did its velocity change with respect to clock time during this interval?

answer/question/discussion: ->->->->->->->->->->->-> : 2m/s^2 2 meters per seconds per second.

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Solution

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