Position, acceleration, and time for free fall (2-14)

Question 1 of 5

Question

$\textbf{Acceleration due to gravity}$

{"title":"Position at time t","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,27,28,55\"}]"} {"title":"position at time = 0","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"55,24,80,59\"},{\"shape\":\"rect\",\"coords\":\"71,54,71,65\"}]"} {"title":"velocity at time t = 0","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"121,24,147,55\"}]"} {"title":"time at position y","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"271,25,291,55\"},{\"shape\":\"rect\",\"coords\":\"167,24,187,54\"}]"} {"title":"Acceleration due to gravity","description":"Correct!","type":"correct","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"245,23,271,60\"}]"}

Question

$\textbf{Time}$ at which the object is at position $y$

{"title":"Position at time t","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,27,28,55\"}]"} {"title":"position at time = 0","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"55,24,80,59\"},{\"shape\":\"rect\",\"coords\":\"71,54,71,65\"}]"} {"title":"velocity at time t = 0","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"121,24,147,55\"}]"} {"title":"time at position y","description":"Correct!","type":"correct","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"271,25,291,55\"},{\"shape\":\"rect\",\"coords\":\"167,24,187,54\"}]"} {"title":"Acceleration due to gravity","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"245,23,271,60\"}]"}

Question

$\textbf{Velocity at time}$ $\boldsymbol{t} = 0$ of the object

{"title":"Position at time t","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,27,28,55\"}]"} {"title":"position at time = 0","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"55,24,80,59\"},{\"shape\":\"rect\",\"coords\":\"71,54,71,65\"}]"} {"title":"velocity at time t = 0","description":"Correct!","type":"correct","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"121,24,147,55\"}]"} {"title":"time at position y","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"271,25,291,55\"},{\"shape\":\"rect\",\"coords\":\"167,24,187,54\"}]"} {"title":"Acceleration due to gravity","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"245,23,271,60\"}]"}

Question

$\textbf{Position at time}$ $\boldsymbol{t} = 0$ of the object

{"title":"Position at time t","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,27,28,55\"}]"} {"title":"position at time = 0","description":"Correct!","type":"correct","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"55,24,80,59\"},{\"shape\":\"rect\",\"coords\":\"71,54,71,65\"}]"} {"title":"velocity at time t = 0","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"121,24,147,55\"}]"} {"title":"time at position y","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"271,25,291,55\"},{\"shape\":\"rect\",\"coords\":\"167,24,187,54\"}]"} {"title":"Acceleration due to gravity","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"245,23,271,60\"}]"}

Question

$\textbf{Position at time}$ $\boldsymbol{t}$ of an object in free fall

{"title":"Position at time t","description":"Correct!","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,27,28,55\"}]"} {"title":"position at time = 0","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"55,24,80,59\"},{\"shape\":\"rect\",\"coords\":\"71,54,71,65\"}]"} {"title":"velocity at time t = 0","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"121,24,147,55\"}]"} {"title":"time at position y","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"271,25,291,55\"},{\"shape\":\"rect\",\"coords\":\"167,24,187,54\"}]"} {"title":"Acceleration due to gravity","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"245,23,271,60\"}]"}

Review

Note the minus sign in front of each term containing $g$ , which is a reminder that the acceleration is always downward, in the negative $y$ direction. If a freely falling object is rising, it slows down; if the object is descending, it speeds up.