careless850 3 years ago Arianna kicks a soccer ball off the ground and into the air with an initial velocity of 42 feet per second. Assume the starting height of the ball is 0 feet. Approximately, how long does it take until the soccer ball hits the ground again?

1. lgbasallote

this is pure math right? no physics involved?

2. A.Avinash_Goutham

2u/g

3. A.Avinash_Goutham

2.6

4. AndrewNJ

you dont show the angle (to the ground) of that velocity, i cant work out the answer!

5. A.Avinash_Goutham

smart :P but that's not given :P

6. Tushara

if thats the vertical velocity then angle is not needed

7. AndrewNJ

vertical is the angle!

8. Tushara

and i think we can assume dat its the vertical velocity, or the question cant be solved

9. Tushara

yah it shud say dat its projected vertically

10. AndrewNJ

11. careless850

Solving Real-World Problems Involving Quadratic Equations

12. careless850

Arianna kicks a soccer ball off the ground and into the air with an initial velocity of 42 feet per second. Assume the starting height of the ball is 0 feet. Approximately, how long does it take until the soccer ball hits the ground again? 1.3 secs 2.6 secs 16.0 secs 27.6 secs

13. careless850

Better?

14. parthdesai

ya its 2.6

15. AndrewNJ

well my method to solve the prob is a physical way, which needs the angle. can you tell me how to work out 2.6??

16. careless850

Yeah, how'd you get 2.6

17. parthdesai

Well it's more of a common sense guess becuase soccer balls don't stay in the air for 16 seconds or 27.6 and 42 feet per second is not gonna stay in the air for just one second. Also it matches up with A.Avinash_Goutham's answer.

18. parthdesai

I've played soccer for 10 years

19. A.Avinash_Goutham

it can be 1.3 :P a gal can kick a ball that way........real world prob :P

20. parthdesai

Well if it is a question about when it will land it's not gonna go into the goal

21. Tushara

i think da answer wud be 27.6 cos 42 feet per second is pretty fast and so it will stay in air for quite long

22. A.Avinash_Goutham

um y is it 27.6?

23. A.Avinash_Goutham

wat's the value of in fps?

24. Tushara

oh oops, my bad, m wrong

25. Tushara

i divided insted of multiplying

26. GlovemanJR

You can get that by using the formula h(t)= -16t^2+vt+s. V is the velocity ( in this case starting speed) and s is the starting elevation. You'd get -16t^2+42t=0. Then turn that into -16t^2=-42t. Then divide by -16t. It would be t=2.6