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Problem $11\mathrm{.}089-$ Analyze the motion of a particle given $x$ and $y$ as functions of $t$

A ball is thrown so that the motion is defined by the equations $x=4\mathrm{.}200t$ and $y=2+6t-4\mathrm{.}9t^2,$ where $x$ and $y$ are expressed in meters and $t$ is expressed in seconds.

Problem $11\mathrm{.}089.$a $-$ Velocity of a particle given $x$ and $y$ as functions of time

Determine the magnitude and angle of the velocity at $t=1s.($Round the velocity value to three decimal places.$)$

The magnitude of velocity at $t=1s$ is $\frac{m}{s}$ and the angle is @