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4. A 900-kg compact car moving at 60 mi/hr has approximately 320 000 j oules of kinectic energy . Estimate its new kinectic energy if it is moving at 30 mi/hr.
The KE is directly related to the square of the speed. If the speed is reduced by a factor of 2 (as in from 60 mi/hr to 30 mi/hr) then the KE will be reduced by a factor of 4. Thus, the new KE is (320 000 J)/4 or 80 000 J.
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