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vo = 16m/s
a = -2m/s
t=3s
W=?
vt=vo+at
vt=16-2*3
vt= 10m/s
W=ΔEk
W=1/2 m (v1²-v2²)
W=1/2 * 4*(16²-10²)
W=2*156
W=312joule