## michelle_1216_16 2 years ago Julie kicks a moose skin ball off the ground and into the air with an initial velocity of 25 feet per second. Assume the starting height of the ball is 0 feet. Approximately, how long does it take until the moose skin ball hits the ground again? 0.6 sec 0.8 sec 1.6 secs 2.8 secs please help...

1. cwrw238

use the equations of motion with constant accleeration

2. cwrw238

s = ut + 0.5gt^2

3. michelle_1216_16

what are the equations if you dont mind:)

4. cwrw238

s = displacement = 0 g = -32 ft/s62 and u = 25 ft/s

5. cwrw238

0 = 25t - 16t^2 solve for t

6. pwnzerer

cwrw238 you are so wrong that newton cam back to life and died again

7. pwnzerer

@cwrw238

8. michelle_1216_16

so what would the answer be

9. pak_asfand

Michelle i would like to help you but i think that the data is incomplete...

10. michelle_1216_16

but that is how the question is written out what am suppose to do? i could go back and reread the lesson

11. pwnzerer

yes you should you dont even know what equations of motion are

12. michelle_1216_16

you see this is my third time taking this class and i really don't want to fail again.

13. pak_asfand
14. pak_asfand

Ahaha michelle take it easy!

15. michelle_1216_16

i think I will, look over the lesson again,but what do you guys think would be the best way to approach it.

16. pwnzerer

with love

17. michelle_1216_16

:)

18. pak_asfand

The problem that i am having is the fact that they didnt mention at which point in height the balls stops and starts falling back

19. michelle_1216_16

yeah, i guess, i could always email my teacher about it because there are alway's glitches like that happening in the tests.

20. jim_thompson5910

cwrw238 already said it solve 0 = 25t - 16t^2 for t to get your answer (it will be the root that is not 0)

21. michelle_1216_16

um ok, i will go back and do it that way.

22. michelle_1216_16

thanks for the advice everyone, you all have been great so you have a nice day

23. pwnzerer

YOU HAVE TO USE SEQENCES EVERTHING ELSE IS WRONG!!!!!!!!!!!!!!

24. pak_asfand

Good luck!

25. cwrw238

16t^2 - 25 = 0 t(16t - 25) = 0 16t = 25 f = 25/16 = 1.6