How many joules and kilocalories are generated when the brakes are used to bring a 1300kg car to rest from a speed of 90km/h ?
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calculate the KE of car at 90 km/h = 90 x 1000/3600 = 25 m/s
KE = 1/2mV² = (0.5)(1300)(25)² = __________ J ANS-1
convert ANS-1 to kilocalories for ANS-2
come on - U can do this, right? :>)
KE = 1/2mV² = (0.5)(1300)(25)² = __________ J ANS-1
convert ANS-1 to kilocalories for ANS-2
come on - U can do this, right? :>)