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A large boulder is ejected vertically upward from a volcano with an initial speed of 40.7...

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Physics

A large boulder is ejected vertically upward from a volcano withan initial speed of 40.7 m/s . Air resistance may be ignored. A) Atwhat time after being ejected is the boulder moving at a speed 20.3m/s upward? B) At what time is it moving at a speed 20.3 m/sdownward? C)When is the displacement of the boulder from itsinitial position zero? D)When is the velocity of the boulder zero?E)What is the magnitude of the acceleration while the boulder ismoving? F)What is the direction of the acceleration while theboulder is moving? (up or down)

Answer & Explanation Solved by verified expert
4.4 Ratings (696 Votes)
Remember that acceleration means the rate at which velocity changes When something accelerates due to gravity near the earths surface its vertical speed changes by 98 ms every second While its rising its speed DECREASES by 98 ms every second and while its falling its speed INCREASES by 98 ms every second So it starts at 407 ms After 1 second it has slowed    See Answer
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