The $v-s$ graph for a go$-$cart traveling on a straight road is

shown.

$($Figure $1)$

Part A

Given $v_1=16\frac{m}{s},s_1=120m,s_2=240m,$ determine the acceleration of the go$-$cart at $s=60m.$

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

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Part B

Determine the acceleration of the go$-$cart at $s=180m.$

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

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