The figure below shows a graph of Vx versus $t$ for the motion of a motorcyclist as he starts from rest and moves along the road in a straight line.

$($a$)$ Find the average acceleration for the time interval $t=0$ to $t=6\mathrm{.}0s$

$?=\frac{m}{s^2}$

$($b$)$ Estimate the time at which the acceleration has its greatest positive value.

$?=$s

What is the value of the acceleration at that instant?

$?=$m$/$s$^2$

$($c$)$ When is the acceleration zero?

Acceleration is zero when $t=$ s and when $t>$ S$.$

$($d$)$ Estimate the maximum negative value of the acceleration.

$\frac{m}{s^2}$

At what time does it occur?

$?=$s

The figure below shows a graph of $v_x$ versus $t$ for theotion of a motorcyclist as he starts from rest and moves along the road in a straight line.

$($a$)$ Find the average acceleration for the time interval $t=0$ to $t=6\mathrm{.}0s.$

$\frac{m}{s^2}$

$($b$)$ Estimate the time at which the acceleration has its greatest positive value.

$s$

What is the value of the acceleration at that instant?

$\frac{m}{s^2}$

$($c$)$ When is the acceleration zero?

Acceleration is zero when $t$

$s$ and when $t>$ s$.$

$($d$)$ Estimate the maximum negative value of the acceleration.

$\frac{m}{s^2}$

At what time does it occur?