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A 1000 kg car going 10 m/s is braked to rest. Work done on car?
A+100 kJ
B-50 kJ
C-100 kJ
D+50 kJ
Answer & Solution
Correct answer: B. -50 kJ
Work equals the change in kinetic energy, 0 minus 0.5 x 1000 x 100, which is -50 kJ.
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