Скачать или смотреть Exercise 2.48 A large boulder is ejected vertically upward from a volcano with an initial speed of …

Exercise 2.48 A large boulder is ejected vertically upward from a volcano with an initial speed of 40.5 m/s. Air resistance may be ignored. Part A At what time after being ejected is the boulder moving at a speed of 20.5 m/s upward? t = 2.04 s Part B At what time is it moving at a speed of 20.5 m/s downward? t = 6.22 s Part C When is the displacement of the boulder from its initial position zero? t = 8.27 s Part D When is the velocity of the boulder zero? t = 4.13 s Part E What is the magnitude of the acceleration while the boulder is moving? a = m/s^2 Part F What is the direction of the acceleration while the boulder is moving? up down

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