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3. Two trains, one traveling at 72 km/h and the other traveling at 120 km/h, are heading towards each other on the same track. When they are 875 m apart, the train engineers see one another and apply the brakes at the same time (a miraculous coincidence). The brakes decelerate the trains at a rate of 1.1 m/s. Will the trains collide? Answer: No, they stop 194 m apart. 6. Raindrops fall from a cloud 1700 m above the Earth's surface. If there were no air resistance, how fast would the drops be traveling when they struck the surface? Answer: 183 m/s 7. A boy stands on a bridge 50 m above the surface of a lake. Floating on the lake, 15 m away from a point on the lake just below the boy, is a toy boat. The boy drops a rock from the bridge. With what constant velocity must the boat be moving in order to catch the rock just before it hits the lake? Answer: 4.7 m/s

3. Two trains, one traveling at 72 km/h and the other traveling at 120 km/h, are heading towards each other on the same track. When they are 875 m apart, the train engineers see one another and apply the brakes at the same time (a miraculous coincidence). The brakes decelerate the trains at a rate of 1.1 m/s. Will the trains collide? Answer: No, they stop 194 m apart. 6. Raindrops fall from a cloud 1700 m above the Earth's surface. If there were no air resistance, how fast would the drops be traveling when they struck the surface? Answer: 183 m/s 7. A boy stands on a bridge 50 m above the surface of a lake. Floating on the lake, 15 m away from a point on the lake just below the boy, is a toy boat. The boy drops a rock from the bridge. With what constant velocity must the boat be moving in order to catch the rock just before it hits the lake? Answer: 4.7 m/s

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Please solve 5, 6, and 7

3. Two trains, one traveling at 72 km/h and the other traveling at 120 km/h, are heading towards each other on the same track. When they are 875 m apart, the train engineers see one another and apply the brakes at the same time (a miraculous coincidence). The brakes decelerate the trains at a rate of 1.1 m/s. Will the trains collide? Answer: No, they stop 194 m apart. 6. Raindrops fall from a cloud 1700 m above the Earth's surface. If there were no air resistance, how fast would the drops be traveling when they struck the surface? Answer: 183 m/s 7. A boy stands on a bridge 50 m above the surface of a lake. Floating on the lake, 15 m away from a point on the lake just below the boy, is a toy boat. The boy drops a rock from the bridge. With what constant velocity must the boat be moving in order to catch the rock just before it hits the lake? Answer: 4.7 m/s
Transcribed Image Text:3. Two trains, one traveling at 72 km/h and the other traveling at 120 km/h, are heading towards each other on the same track. When they are 875 m apart, the train engineers see one another and apply the brakes at the same time (a miraculous coincidence). The brakes decelerate the trains at a rate of 1.1 m/s. Will the trains collide? Answer: No, they stop 194 m apart. 6. Raindrops fall from a cloud 1700 m above the Earth's surface. If there were no air resistance, how fast would the drops be traveling when they struck the surface? Answer: 183 m/s 7. A boy stands on a bridge 50 m above the surface of a lake. Floating on the lake, 15 m away from a point on the lake just below the boy, is a toy boat. The boy drops a rock from the bridge. With what constant velocity must the boat be moving in order to catch the rock just before it hits the lake? Answer: 4.7 m/s
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