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A cannon ball is launched into the air with an upward velocity of 142 feet per second, from a 7-foot tall cannon. The height h of the cannon ball after t seconds can be found using the equation h=-16t² + 142t + 7. Approximately how long later will the cannon be at 69 feet high? Round answers to the nearest tenth if necessary. units: How long later will it hit the ground? units:

A cannon ball is launched into the air with an upward velocity of 142 feet per second, from a 7-foot tall cannon. The height h of the cannon ball after t seconds can be found using the equation h=-16t² + 142t + 7. Approximately how long later will the cannon be at 69 feet high? Round answers to the nearest tenth if necessary. units: How long later will it hit the ground? units:

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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A cannon ball is launched into the air with an upward velocity of 142 feet per second, from a 7-foot tall cannon. The height h of the cannon ball after t seconds can be found using the equation h=-16t² + 142t + 7. Approximately how long later will the cannon be at 69 feet high? Round answers to the nearest tenth if necessary. units: How long later will it hit the ground? units:
Transcribed Image Text:A cannon ball is launched into the air with an upward velocity of 142 feet per second, from a 7-foot tall cannon. The height h of the cannon ball after t seconds can be found using the equation h=-16t² + 142t + 7. Approximately how long later will the cannon be at 69 feet high? Round answers to the nearest tenth if necessary. units: How long later will it hit the ground? units:
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