如图所示,在倾角 θ = 37° 的足够长的固定斜面上,有一质量 m = 1 kg 的物体,物体与斜面间的动摩擦因数 μ = 0.2 ,物体受到沿平行于斜面方向向上的轻绳的拉力 F = 9.6 N 的作用,从静止开始运动,经 2 s 绳子突然断了,求绳断后经多长时间物体速度的大小达到 22 m /s 。 (sin 37° = 0.6 ,取 g = 10 m /s 2 )
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