A large boulder is ejected vertically upward from a volcano withan initial speed of 40.0 m/s. Ignore air resistance. When is the velocity of the boulder zero?
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A large boulder is ejected vertically upward from a volcano with
an initial speed of 40.0 m/s. Ignore air resistance. When is the velocity of the boulder
zero?
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- A 0.54-kg ball is thrown vertically upward with an initial speed of 14.0 m/s. What is the speed of the ball when it hastravelled three-quarters of the distance to its maximum height?A hot air balloon has just lifted off and is rising at a constant rate of 2.0 m/s. Suddenly one of the passengers realizes she has left her camera on the ground. A friend picks it up and tosses it straight upward with an initial speed of 12 m/s. If the passenger is 2.5 m above her friend when the camera is tossed, how high is she above her friend when the camera reaches he ?An attacker at the base of a castle wall 3.80 m high throws a rock straight up with speed 8.40 m/s from a height of 1.40 m above the ground. (a) Will the rock reach the top of the wall? Yes, No (b) If so, what is its speed at the top? If not, what initial speed must it have to reach the top? m/s(c) Find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 8.40 m/s and moving between the same two points. m/s(d) Does the change in speed of the downward-moving rock agree with the magnitude of the speed change of the rock moving upward between the same elevations? Yes, No (e) Explain physically why it does or does not agree.
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