Word problem

[Kyle Concannon]

I need help on this problem. The v(in feet per second) of an object is given by v= 2gh (inside the square root sign) where g= 32 feet per second and h is the distance (in feet) the object has fallen. Find the height from which a rock has dropped if it strikes the ground with a velocity of 80 feet per second.

I have no earthy idea how to set it up or answer it.

Please show me the steps so I know in the future.

 

[ting]

Ok

You have to rearrange the formula to make h the subject.

v = sqrt(2gh)

v^2 = 2gh

(v^2)/2g = h


Substitute and solve.

(80^2)/(2*32) = h


Solve for h and check.


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