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Daky Dazzo
Answers (1)
Data given Mass,m=0.2kg Height,h=20m Energy lost,E=30J Height after rebound=required from PE after rebound=Original PE-Energy lost mgh'=mgh-E but 'g' is constant, g=10 0.2×10×h'=(0.2×10×20)-30 2h'=40-30 2h'=10 divide by 2 both sides 2h'÷2=10÷2 h'=5
