QUESTION 4 You are on the roof of a Physics Building, 31 m above the ground. Your physics professor, who is 1.86 m tall, is approaching the building at constant speed of 1.41 m/s. If you wish to drop an egg on his head, how far should your professor be when you release the egg? 2.79
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- 2. Christopher watches a stick float downstream in a river and notices that it moves 15 m [E] in a time of 2.5 x 101 s. His friend, John, is starting on the south side of the river and is going to swim across. In still water, John knows that he can swim with a speed of 1.2 m/s, relative to the water. a) What is John’s velocity relative to the shore? b) If the river is 1.5 km wide, how long will it take John to cross the river? c) How far downstream will be land?A girl is standing at the edge of a cliff 100. m above the ground. She reaches out over the edge of the cliff and throws a rock straight upward with a speed 8.00 m/s. a) How long does it take the rock to hit the ground? b) What is the speed of the rock the instant before it hits the ground? Please type answer1. A student throws a ball up in the air with an initial velocity of 392m/s. How high does the ball travel in the air before it begins to fall to the ground?
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