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vo=5m/s
W= 400 joule
vt=?
W=ΔEk
W= 1/2 m (vt²-vo²)
400 = 1/2 * 4*(vt²-5²)
400 = 2 (vt²-25)
200 = vt²-25
225 = vt²
vt = √225
vt = 15m/s
jadi kecepatannya 15m/s