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m = 240 kg
s = 2m
t = 5s
g = 10 N/kg
F = m x g [ kg x N/kg = N ]
F = 240 x 10 = 2400 N
W = F x s [N x m = J ]
W = 2400 x 2 = 4800 J
P = W/t [J/s = W ]
P = 2400 : 5 = 960 W
W=E
E=mgh
E=240kg*10m/s²*2m=4800J
P=4800J/5=960W