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m2 = 4kg
Ek1 = Ek2
v1 = 10 m/s
v2 = ?
Ek1 = Ek2
1/2 mv2 = 1/2 mv2
1/2 . 2 . 100 = 1/2 . 4 × v2
100 = 2 × v2
v2 = 50
v = √50
= 5√2