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s= 2m
t= 4s
P = W/t
W= F × s
F= m × a
a= v ÷ t
v= 0.5 m/s
a= 0.5 m/s ÷ 4s = 0.125 m/s²
F= 50 kg × 0.125 m/s² = 6.25
W= 6.25 × 2 = 12.5
P= 12.5/ 4 = 3.125