When a soccer ball is kicked towards a player he deflects the ball by heading it, the acceleration of the head during the collision can be significant. In the figure gives the measured acceleration $a\left(t\right)$ of a soccer player's head for a bare head and a helmeted head, starting from rest. The scaling on the vertical axis is set by $a_{\mathrm{s}}=200 \mathrm{m} {\mathrm{s}}^{-2}$. At time $t=7.0 \mathrm{m} \mathrm{s}$, what is the difference in the speed acquired by the bare head and the speed acquired by the helmeted head?

 

A salamander of the genus. Hydromantes captures prey by launching its tongue as a projectile the skeletal part of the tongue is shot forward, unfolding the rest of the tongue, until the outer portion lands on the prey, sticking to it. In the figure shows the acceleration magnitude $a$ versus time $t$ for the acceleration phase of the launch in a typical situation. The indicated accelerations are $a_2=400 \mathrm{m} {\mathrm{s}}^{-2}$ and $a_1=100 \mathrm{m} {\mathrm{s}}^{-2}$. What is the outward speed of the tongue at the end of the acceleration phase?

How far does the runner whose velocity-time graph, is shown in the figure travel in $16 \mathrm{s}$? The figure's vertical scaling is set by $v_{\mathrm{s}}=8.0 \mathrm{m} {\mathrm{s}}^{-1}$