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vt² = 0+2.10.20
vt = √400
vt = 20m/s
b.Em = Ek + Ep
m.g.h1 = Ek + Ep
1.10.20 = Ek + 50
200 = Ek + 50
Ek = 150 J
Ep = m.g.h
Ep = 1.10.5
Ep = 50 J