A jumping frog is leaving the ground at an angle of 30° and with an initial speed of 4.62 m/s. (a) How high does the frog leap? (b) How far does the frog leap?
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A jumping frog is leaving the ground at an angle of 30° and with an initial speed of 4.62 m/s.
(a) How high does the frog leap?
(b) How far does the frog leap?
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- 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.A golf ball rolls off a horizontal cliff with an initial speed of 15.0 m/s. The ball falls a vertical distance of 16.5 m into a lake below. (a)How much time does the ball spend in the air? (b) What is the speed v of the ball just before it strikes the water?An attacker at the base of a castle wall 3.65 m high throws a rock straight up with speed 7.40 m/s at a height of 1.55 m above the ground. (a) Will the rock reach the top of the wall? (b) If so, what is the rock’s speed at the top? If not, what initial speed must the rock have to reach the top? (c) Find the change in the speed of a rock thrown straight down from the top of the wall at an initial speed of 7.40 m/s and moving between the same two points. (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? Explain physically why or why not.
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