Answer:
\[m=200kg\] \[h=?\] \[\frac{60}{100}=\frac{\frac{w}{t}}{200}\] \[PE=9800\,J\] \[PE=mgh\] \[h=\frac{PE}{mg}=\frac{9800}{9.8\times 200}=\frac{1000}{200}=5m\]
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