Question below...........................

asked Aug 1, 2022 38.0k views

3 votes

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$\boxed{\sf PE=mgh}$

$\boxed{\sf KE=(1)/(2)mv^2}$

$\boxed{\sf ME=KE+PE}$

$\\ \sf\longmapsto PE=60(0)(10)=0J$

$\\ \sf\longmapsto KE=(1)/(2)(60)(8)^2=30(64)=1920J$

$\\ \sf\longmapsto ME=1920+0=1920J$

$\\ \sf\longmapsto PE=60(10)(1)=600J$

$\\ \sf\longmapsto KE=600J$

$\\ \sf\longmapsto ME=1200J$

Now

$\\ \sf\longmapsto (1)/(2)mv^2=600\implies 30v^2=600\implies v^2=20\implies v=4.2m/s$

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