Answer:
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Step-by-step explanation:
We are asked to calculate the force needed to accelerate a 40 kilogram mass by 4 meters per second per second.
According to Newton's Second Law of Motion, force is the product of mass and acceleration. Therefore, the formula is:

The mass is 40 kilograms and the acceleration is 4 meters per second squared. Substitute these values into the formula.
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Multiply.
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Convert the units. 1 kilogram meter per second squared is equal to 1 Newton. Our answer of 160 kilogram meters per second square is equal to 160 Newtons.
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A force of 160 Newtons is required.