请老师帮助物理高中题-解题OK````````````````````

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请老师帮助物理高中题-解题OK````````````````````
请老师帮助物理高中题-解题

OK````````````````````

请老师帮助物理高中题-解题OK````````````````````
用运动学公式写出来很繁琐,所以我用物理的第二把钥匙——功来解决
画出受力分析图则知道摩擦力f=μmgcosθ ①
因为重力没做功,摩擦力做的功W=fs
所以根据动能定理可知fs=(1/2)m(vt^2)-(1/2)m(v0^2) ②
根据①②式可得vt=√(2μgscosθ)