A car (m=1000 kg) is initially moving at a speed of 20 m/s (~45 mph) when the driver hits the brakes and comes to a stop. How much net work was done on the car to bring it to a stop? (1 kJ = 1000 Joules) a. -1000 kJ b. -400 kJ c. -200 kJ d. -66.7 kJ e. -2.00kJ
A car (m=1000 kg) is initially moving at a speed of 20 m/s (~45 mph) when the driver hits the brakes and comes to a stop. How much net work was done on the car to bring it to a stop? (1 kJ = 1000 Joules)
a. -1000 kJ
b. -400 kJ
c. -200 kJ
d. -66.7 kJ
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