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A post of length 1.9 m needs to be driven into the ground to 60% of its length, using a mechanical hammer. If the first blow drives the pole by 13 cm and each subsequent blow is reduced by 0.75 cm, determine the number of blows needed to achieve this. Comment, with reasons, on the validity of the results obtained Proof of the result using quadratic formula.

A post of length 1.9 m needs to be driven into the ground to 60% of its length, using a mechanical hammer. If the first blow drives the pole by 13 cm and each subsequent blow is reduced by 0.75 cm, determine the number of blows needed to achieve this. Comment, with reasons, on the validity of the results obtained Proof of the result using quadratic formula.

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 post of length 1.9 m needs to be driven into the ground to 60% of its length, using a mechanical hammer. If the first blow drives the pole by 13 cm and each subsequent blow is reduced by 0.75 cm, determine the number of blows needed to achieve this. Comment, with reasons, on the validity of the results obtained

Proof of the result using quadratic formula.

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