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Lúc 7h sáng 2 xe chuyển động thẳng đều, đi cùng chiều qua hai điểm A vs B cách nhau 12km. vân tốc của xe đi qua A là 54km/h; của xe đi qua B là 48km/h.
a viết phương trình chuyên động của hai xe
b xác định thời gian thơi điểm và vị trí xe A đuổi kip xe B
c vẽ đô thị tọa độ - thơi gian của 2 xe trên trên cùng một hệ tục độ. nhật xét ?
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Answers: 2
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Abasketball star covers 2.65 m horizontally in a jump to dunk the ball. his motion through space can be modeled precisely as that of a particle at his center of mass. his center of mass is at elevation 1.02 m when he leaves the floor. it reaches a maximum height of 1.90 m above the floor and is at elevation 0.910 m when he touches down again. (a) determine his time of flight (his "hang time"). (b) determine his horizontal velocity at the instant of takeoff. (c) determine his vertical velocity at the instant of takeoff. (d) determine his takeoff angle. (e) for comparison, determine the hang time of a whitetail deer making a jump with center-of-mass elevations yi = 1.20 m, ymax = 2.45 m, and yf = 0.750 m.
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Lúc 7h sáng 2 xe chuyển động thẳng đều, đi cùng chiều qua hai điểm A vs B cách nhau 12km. vân tốc củ...
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