At a given instant the train engine at E has a speed of $v=25\frac{m}{s}$ and an acceleration of $a=10\frac{m}{s^2}$ acting in the direction shown. $($Figure $1)$

Part A

Determine the rate of increase in the train's speed.

Express your answer to three significant figures and include the appropriate units.

$\frac{}{n}$harrharr Units

$a_t=$ Value

Part B

Determine the radius of curvature $$ of the path.

Express your answer to three significant figures and include the appropriate units.

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