# Outward speed of salamander tongue

1. Aug 26, 2015

### rgold

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. 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 a2 = 405m/s^2 and a1 = 120m/s^2. What is the outward speed of the tongue at the end of the acceleration phase?
http://edugen.wileyplus.com/edugen/courses/crs7165/art/qb/qu/ch0/EAT_13904629146110_9951108919932922.gif
i found the area under each part so from 0-10 was 0
from 10-20 was .5x10x120=600
from 20-30 was (10x120)+(.5x10(405-120))=2625
and from 30-40 was .5x10x405=2025
i added all them together and got 5250m/s but i am not getting the answer right. can you help me?

2. Aug 26, 2015

### paisiello2

3. Aug 26, 2015

### rgold

4. Aug 26, 2015

### paisiello2

5. Aug 26, 2015

### rgold

here is the graph

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6. Aug 26, 2015

### paisiello2

Your solution appears to be right to me.

7. Aug 26, 2015

### rgold

k i guess it is just a computer glitch. thanks so much for you help!

8. Sep 12, 2015

### sz96

You forgot to change your units from milli seconds to seconds. Your answer must be divided by 1000.