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timofeeve [1]
3 years ago
6

PLEASE HELP SOON I DONT UNDERSTAND THIS QUIZ

Mathematics
1 answer:
Fantom [35]3 years ago
6 0

1. h₀ = 70  

v₀ = 0 since the rock is dropped it has no initial velocity  

when the rock hits the ground the height = 0  

plug into the formula  

0 = -4.9t² + 0(t) + 70  

0 = -4.9t² + 70  

Add 4.9t² to both sides  

4.9t² = 70  

Divide both sides by 4.9  

t² = 14.2857142857  

Take the square root of both sides  

t = 3.7796447301  

t ≈ 3.8 seconds

I am not doing the rest I only did one just to help you understand a bit more

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If you want to verify this, you can solve for "x" from both equations:

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