A chestnut falls out of a tree 45 feet above the ground. Use the vertical motion model, H=-16t^2+vt+s s to find how long it takes to hit the ground. Round your answer to the nearest tenth. Remember to include units in your answer.

1.7 seconds

Step-by-step explanation:

we have

where

v is the initial velocity (in feet per second)

s represents the initial height (in feet)

In this problem we have

---> because the object is dropped

substitute

Remember that

When the chestnut hit the ground the value of H is equal to zero

so

For H=0

solve for t

therefore

The solution is t=1.7 sec