1: In this problem "up" is taken to be positive.
A vertically upward thrown rock has a
positive initial velocity
positive final velocity
positive acceleration
positive final height
2: In this problem "up" is taken to be positive.
A falling object has
positive acceleration and positive velocity.
negative acceleration and negative velocity.
positive acceleration and negative velocity.
negative acceleration and positive velocity.
3: In this problem, with respect to the coordinate system, the "up" direction is taken to be positive.
An object moving upward under the influence of gravity has
positive acceleration and positive velocity
negative acceleration and negative velocity.
positive acceleration and negative velocity
negative acceleration and positive velocity
4: A ball is dropped off a ledge. How far does it fall in the 2nd second? Or, what is the height of the ball at time= 2 seconds?
4.9 meters
9.8 meters
19.6 meters
23.4 meters
5: Ball A is thrown upward at the same time as ball B and with half the speed of ball B. Which of the following is true?
They will hit the ground at the same time.
A will hit before B.
B will hit before A
Neither will ever hit the ground
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