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A student throws a heavy red ball horizontally from a balcony of a tall building with an initial speed v0. At the same time, a second student drops a lighter blue ball from the same balcony. Neglecting air resistance, which statement is true? (a) The blue ball reaches the ground first, (b) The balls reach the ground at the same instant, (c) The red ball reaches the ground first, (d) Both balls hit the ground with the same speed, (e) None of statements(a) through(d) is true.
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- Suppose I throw a rock horizontally with an initial speed of 30 m/s. Suppose my release point is 2 m above the ground. (a) How long does it take for the rock to hit the ground? (b) How far in the horizontal direction does the rock travel? (c) What is the speed of the rock right before it hits the ground?arrow_forwardA crazy, young boy on a sled is able to get up to an incredible speed of 22.5 m/s (yes, he is wearing a helmet!)along a frictionless horizontal surface while he approaches an icy hill with a vertical height of 11 m, as shown.He makes it to the top, and then flies off horizontally from the ledge of the hill. How far from the base of thehill does the boy land?arrow_forwardA student throws a heavy red ball horizontally from a balcony of a tall building with an initial speed vo. At the same time, a second student throws a lighter blue ball horizontally from the same balcony with an initial speed vo/2. Ignoring air resistance, which of the following statements must be true? [There may be more than one correct answer.] Both balls hit the ground with the same angle of impact. Both balls hit the ground with the same vertical velocity component While each ball is in the air, the red ball has the greater magnitude of acceleration. The red ball hits the ground with the greater speed. | The balls reach the ground at the same instant.arrow_forward
- An attacker at the base of a castle wall 3.60 m high throws a rock straight up with speed 7.50 m/s from a height of 1.60 m above the ground. a) what is its speed at the top? If not, what initial speed must it have to reach the top? b) Find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 7.50 m/s and moving between the same two points. c) 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? d) Explain physically why it does or does not agree.arrow_forwardYou stand on the edge of a very tall building with three rocks, which you are going to throw off the edge. You throw the first rock straight outwards, the second rock at an angle 60° above the horizontal, and the third rock 30° below the horizontal. If you throw all three rocks with the same initial speed, which will be moving the fastest when it hits the ground? The first rock The second rock. They will all have the same speed. The third rockarrow_forwardAn attacker at the base of a castle wall 3.60 m high throws a rock straight up with speed 8.20 m/s at a height of 1.50 m above the ground. (a) If so, what is the rock's speed at the top? If not, what initial speed must the rock have to reach the top? m/s(b) Find the change in the speed of a rock thrown straight down from the top of the wall at an initial speed of 8.20 m/s and moving between the same two points. m/s(c) Does the change in speed of the downward-moving rock agree with the magnitude of the speed change of the rock moving upwards between the same elevations? Explain physically why or why not.arrow_forward
- A rock is thrown off a cliff at an angle of 54° above the horizontal. The cliff is 110 m high. The initial speed of the rock is 20 m/s. (Assume the height of the thrower is negligible.)arrow_forwardJenny and Jack throw identical balls off a tall building at the same time. The ground near the building is flat. Jenny throws her ball straight downward. Jack throws his ball downward and outward such that the angle between the initial velocity of the ball and the horizon is 30°. Jack throws the ball with a speed twice that of Jenny's ball. If air resistance is negligible, which ball hits the ground first? Jenny's ball hits first. It is impossible to know from the information given. Jack's ball hits first. They hit at the same timearrow_forwardAn attacker at the base of a castle wall 4.00 m high throws a rock straight up with speed 4.50 m/s from a height of 1.60 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 4.50 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? YesNo (e) Explain physically why it does or does not agree.arrow_forward
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