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Stolb23 [73]
3 years ago
8

A ball is thrown in the air from a ledge. Its height in tesspresented by

Mathematics
1 answer:
Rus_ich [418]3 years ago
8 0

Answer:

6 .74 seconds

Step-by-step explanation:

The height of the ball is given by the equation:

R(x) =  - 16( {x}^{2}  - 5x - 6)

When the ball hit the ground, then;

R(x) =  0 \\ - 16( {x}^{2}  - 5x - 6) = 0 \\ {x}^{2}  - 5x - 6 = 0 \\ x = -0.74 \:  Or \:  6.74

We discard x=-0.74 since time is not negative.

Therefore the ball hit the ground after 6.74 seconds.

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