A boy 2

A boy dropped a coin from the top of the dry well and heard a sound 6 seconds later. Considering this as a free-fall object, how deep is the well? The speed of sound in air is approximately 343 m/s.

Correct answer:

h =  151.5 m

Step-by-step explanation:

g=9.81 m/s2 t=6 s v=343 m/s  h = 21 g t12 = v t1 t1+t2 = t  0.5 g x2=v (tx)  0.5 9.81 x2=343 (6x) 4.9050000000002x2+343x2058=0  a=4.905;b=343;c=2058 D=b24ac=343244.905(2058)=158026.96 D>0  x1,2=2ab±D=9.81343±158026.96 x1,2=34.964322±40.522533 x1=5.558210954 x2=75.486855195  t1=x1=5.55825.5582 s t2=tt1=65.55820.4418 s  h=v t2=343 0.4418=151.5 m

Our quadratic equation calculator calculates it.

Did you find an error or inaccuracy? Feel free to write us. Thank you!

Tips for related online calculators
Are you looking for help with calculating roots of a quadratic equation?
Need help calculating sum, simplifying, or multiplying fractions? Try our fraction calculator.
Check out our ratio calculator.
Do you have a linear equation or system of equations and are looking for its solution? Or do you have a quadratic equation?
Do you want to convert velocity (speed) units?
Do you want to convert time units like minutes to seconds?

You need to know the following knowledge to solve this word math problem:

Related math problems and questions: