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Stopping force of a mass: Time required

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How long does it take to stop a 3X10-5kg mass moving at 2X104m/sec by applying a stopping force of 12N on this mass?

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The concise solution is supported with explanations. The stopping force of a mass and time required is calculated.

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The numerical values you had provided for the mass and initial velocity of the body are not clear and hence I will use symbols for the quantities and will derive the ...

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