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?

Question

lgbasallote · Answer

this is pure math right? no physics involved?

anonymous · Answer

2u/g

anonymous · Answer

2.6

anonymous · Answer

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

anonymous · Answer

smart :P
but that's not given :P

anonymous · Answer

if thats the vertical velocity then angle is not needed

anonymous · Answer

vertical is the angle!

anonymous · Answer

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

anonymous · Answer

yah it shud say dat its projected vertically

anonymous · Answer

so, bad question. :)

anonymous · Answer

Solving Real-World Problems Involving Quadratic Equations

anonymous · Answer

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

anonymous · Answer

Better?

anonymous · Answer

ya its 2.6

anonymous · Answer

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??

anonymous · Answer

Yeah, how'd you get 2.6

anonymous · Answer

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.

anonymous · Answer

I've played soccer for 10 years

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

um y is it 27.6?

anonymous · Answer

wat's the value of in fps?

anonymous · Answer

oh oops, my bad, m wrong

anonymous · Answer

i divided insted of multiplying

anonymous · Answer

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