Answer:
Earth Unknown planet
\[=wh(\because w=mg)\Rightarrow {{w}_{1}}{{h}_{1}}={{w}_{2}}{{h}_{2}}\] \[{{w}_{2}}=\frac{{{w}_{1}}{{h}_{1}}}{{{w}_{2}}}=\frac{600\times h}{4h}=150N\] Weight of the body on the unknown planet is 150 N. \[{{h}_{1}}=h\] \[{{h}_{2}}=4h\] \[P{{E}_{1}}=P{{E}_{2}}\] \[{{W}_{1}}=600N\] \[{{W}_{2}}=?\] \[PE=mgh\]
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