## ksaimouli 3 years ago the graph below shows the height h(t) of a bird soaring in the sky after t seconds of observation

1. ksaimouli

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2. ksaimouli

where 2nd derivative +,- or 0 at .8,2,3,4,5.2,6,7

3. ksaimouli

@hartnn how to identify the 2nd derivative graph from function graph

4. heena

2nd derivative mean u have to find velocity on time 2 ,3,4,5,6,7,8 whether it i positive or negative or zero ok now take out ur pencil see the graph at poition 2 put ur pencile in the shape of curve u will fine u move ur pencil clockwise means it is +ve

5. heena

getting?

6. ksaimouli

2nd mean not velocity it means acceleration girl

7. ksaimouli

derivative is velocity

8. ksaimouli

they gave position

9. heena

ok no prob u have to do this same way but thiking logically by comparing it with velocity like in position in time 2 sec u fine velocity in +Ve mean velocity is incereasing and if velocity is increasing then acc muts be +Ve

10. heena

getting?

11. heena

u see till 5sec velocity is increaing means till 5ec acceleration is +Ve but on 5 velocity is constant mean acceleration is zero and then from 6 veolcity is drceasing mean der must be deacceleration so accleration must be -ve

12. ksaimouli

i got i graphed it

13. ksaimouli

taking the critical points

14. heena

great :)