From rest, you step on the gas of your Ferrari, providing a force F for 4 seconds, speeding it up to a final speed v. If the applied force were only ½ F, how long would it have to be applied to reach the same final speed?

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1. From rest, you step on the gas of your Ferrari, providing a force F for 4 seconds, speeding it up to a final speed v. If the applied force were only ½ F, how long would it have to be applied to reach the same final speed?