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质量M=6.0×10 3kg的客机,从静止开始沿平直的跑道滑行,当滑行距离S = 7.2×10 2 m时,达到起飞速度ν=60m/s. (1)起飞时飞机的动能多大? (2)若不计滑行过程中所受的阻力,则飞机受到的牵引力为多大? (3)若滑行过程中受到的平均阻力大小为f=3.0×10 3N,牵引力与第(2)问中求得的值相等,则要达到上述起飞速度,飞机的滑行距离应为多大?
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