The x$-$acceleration is $....$zero at $15$ ?sec$.$

The acceleration magnitude at $15$ ?sec is$...$ ?the acceleration magnitude at $38$ ?sec$.$

At $10$ ?sec$,$ ?the speed is as high as it gets.

The speed at $10$ ?sec is $....$ ?the speed at $73$ ?sec$.$

The x$-$acceleration is$....$ ?zero at $67$ ?sec$.$

Using the graph above, calculate the average speed of the car for the period from $0$ ?to $20\mathrm{.}0$s

(m) Distance 1000 800 600 400 200 20 40 Time (s) 60 80