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a loaded eighteen wheeler is stopped by a frictional force of 2x10^5 N in 50 seconds. What force is needed to stop the truck in

a loaded eighteen wheeler is stopped by a frictional force of 2x10^5 N in 50 seconds.

What force is needed to stop the truck in half the that time?

How much time does it take the truck to stop if the force is only 1x10^5 N?

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