Physics, 18.02.2020 18:47 johajackson2014
As a box slides down a ramp, friction does 23.0 joules of work. At the bottom of the ramp, the box has 3.8 joules of kinetic energy and is traveling at 2.8 m/sec. How high is the ramp?
Answers: 3
![E_{k}=0.5*m*v^{2}\\\\where:\\E_{k}=3.8[J]\\v = 2.8[m/s]\\m=\frac{E_{k}}{0.5*v^{2} } \\m=\frac{3.8}{0.5*2.8^{2} } \\m=0.969[kg]](/tpl/images/0514/3602/0d41a.png)
![E_{p}+W_{f}=E_{k}\\where:\\E_{p}= potential energy [J]\\W_{f}=23[J]\\E_{k}=3.8[J]\\](/tpl/images/0514/3602/e441b.png)
![m*g*h + W_{f}=3.8\\ 0.969*9.81*h - 23= 3.8\\h = \frac{23+3.8}{0.969*9.81}\\ h = 2.81[m]](/tpl/images/0514/3602/ae510.png)
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As a box slides down a ramp, friction does 23.0 joules of work. At the bottom of the ramp, the box h...
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