An airplane increases its velocity from 60m/s to 80m/s in a time of 10s. What is its acceleration?

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At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

What is similar between metals and suspensions