Physics, 07.09.2019 03:10 miracle9704
An object has a position given by r = [2.0 m + (2.00 m/s)t] i + [3.0 m − (1.00 m/s^2)t^2] j, where quantities are in si units. what is the speed of the object at time t = 2.00 s?
Answers: 3
is given by a vector, where the components X and Y are identified by the unit vectors 
and 
(where each unit vector is defined to have a magnitude of exactly one):![r=[2 m + (2 m/s) t] i + [3 m - (1 m/s^{2})t^{2}] j](/tpl/images/0225/0311/8549c.png)
![\frac{dr}{dt}=\frac{d}{dt}[2 m + (2 m/s) t] i + \frac{d}{dt}[3 m - (1 m/s^{2})t^{2}] j](/tpl/images/0225/0311/978bc.png)
This is the velocity vector
the velocity vector is:
This is the velocity vector at 2 seconds
:
This is the speed of the object at 2 seconds
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An object has a position given by r = [2.0 m + (2.00 m/s)t] i + [3.0 m − (1.00 m/s^2)t^2] j, where q...
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