# You took a Tesla Model S for a test drive. The car weighs 4,500 lb and can accelerate from 0 to 60 mph in 2.27 seconds. The car has a 581 kW battery pack. Determine the efficiency of the vehicle. [Ans. to check: 55.5%]

You took a Tesla Model S for a test drive. The car weighs 4,500 lb and can accelerate from 0 to 60 mph in 2.27 seconds. The car has a 581 kW battery pack. Determine the efficiency of the vehicle. [Ans. to check: 55.5%]
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Jaylynn Huffman
Given, mass, $m=\frac{4500lb}{4500×0.4534}$
$m=2041.167kg$
${V}_{max}=60mph=60×0.44704\phantom{\rule{0ex}{0ex}}=26.8224m/s$
accelerator=$\frac{{V}_{max}-{V}_{min}}{t}=\frac{26.8224}{2.27}$
$a=11.816m/{s}^{2}$
$Power=F×Varg=maVarg\phantom{\rule{0ex}{0ex}}=2041.167×11.816×\left[\frac{26.8224+0}{2}\right]$
${P}_{oot}=323458.04klatts$
$Efficiency\left(n\right)=\frac{Poot}{Pin}=\frac{323.4}{581}=55.6$