Question

7. The height Of an object x seconds after it is kicked in the air is modeled by the expression -16 + 8t. How long does it take the object to hit the ground?

Answer 1

2 seconds

Explanation:

The height of the object is modeled by the expression -16 + 8t.

It means we have

`h=-16+8t`

Now, when the object hits the ground, the height must be zero.

Hence, substitute h = 0 in the above equation

`0=-16+8t\\\\8t=16\\\\t=2`

Therefore, it will take 2 seconds to hit the ground.