The position of a particle is given by where t is in seconds and the coefficients have the proper units for r to be in meters. The magnitude and direction of at t = 1.0 s are:
1. 4 m/s at with x-axis
2. 4 m/s at with x-axis
3. 5 m/s at with y-axis
4. 5 m/s at with x-axis
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