Average velocity for linear motion (2-1)

Question 1 of 4

Question

$\textbf{Elapsed time}$ for the time interval: The object is at $x_1$ at time $t_1$ , and $x_2$ at time $t_2$ , so the elapsed time is $\Delta{t }= t_2 - t_1$ .

{"title":"Velocity","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,26,28,54\"}]"} {"title":"X \$\\sub{2}) and t\\(\\sub{2}\$","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"126,6,163,37\"},{\"shape\":\"rect\",\"coords\":\"134,51,166,91\"}]"} {"title":"Displacement","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"166,6,185,32\"},{\"shape\":\"rect\",\"coords\":\"256,8,300,35\"}]"} {"title":"Elapsed time","description":"Correct!","type":"correct","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"263,43,293,75\"},{\"shape\":\"rect\",\"coords\":\"168,48,190,75\"}]"}

Question

$\textbf{Displacement}$ (change in position) of the object over a certain time interval: The object moves from $x_1$ to $x_2$ , so $\Delta{x} = x_2 - x_1$ .

{"title":"Velocity","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,26,28,54\"}]"} {"title":"X \$\\sub{2}) and t\\(\\sub{2}\$","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"126,6,163,37\"},{\"shape\":\"rect\",\"coords\":\"134,51,166,91\"}]"} {"title":"Displacement","description":"Correct!","type":"correct","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"166,6,185,32\"},{\"shape\":\"rect\",\"coords\":\"256,8,300,35\"}]"} {"title":"Elapsed time","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"263,43,293,75\"},{\"shape\":\"rect\",\"coords\":\"168,48,190,75\"}]"}

Question

For both the displacement and the elapsed time, subtract the earlier value ( $x_1$ or $t_1$ ) from the later value ( $x_2$ or $t_2$ ).

{"title":"Velocity","description":"Incorrect","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,26,28,54\"}]"} {"title":"X \$\\sub{2}) and t\\(\\sub{2}\$","description":"Correct!","type":"correct","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"126,6,163,37\"},{\"shape\":\"rect\",\"coords\":\"134,51,166,91\"}]"} {"title":"Displacement","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"166,6,185,32\"},{\"shape\":\"rect\",\"coords\":\"256,8,300,35\"}]"} {"title":"Elapsed time","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"263,43,293,75\"},{\"shape\":\"rect\",\"coords\":\"168,48,190,75\"}]"}

Question

$\textbf{Average velocity}$ of an object in linear motion

{"title":"Velocity","description":"Correct","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"rect\",\"coords\":\"1,26,28,54\"}]"} {"title":"X \$\\sub{2}) and t\\(\\sub{2}\$","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"126,6,163,37\"},{\"shape\":\"rect\",\"coords\":\"134,51,166,91\"}]"} {"title":"Displacement","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"166,6,185,32\"},{\"shape\":\"rect\",\"coords\":\"256,8,300,35\"}]"} {"title":"Elapsed time","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"263,43,293,75\"},{\"shape\":\"rect\",\"coords\":\"168,48,190,75\"}]"}

Review

In Equation 2-1 $\Delta{x}$ (“delta-x”) is an abbreviation for the change $x_2 - x_1$ in the position $x$ , and $\Delta{t}$ (“delta-t”) is an abbreviation for the change $t_2 - t_1$ in the time $t$ ; that is, the elapsed time.