Answer:
4.5kg
Step-by-step explanation:
Work(w)=force(m)×distance(d)
force = mass × acceleration(A)
W=1800J,Mass=m, A=10m/s^2(constant value),distance=40m
1800=m×10×40
1800=400m
divide both sides by 400
m=1800/400
m=4.5kg
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