gg studyIGuided Sol... X Y What is the energy require... x c What is The Energy

Question

gg studyIGuided Sol... X Y What is the energy require... x c What is The Energy Requir x c What is The Energy Recur.. x ms/mod/ibis/view.php?id 3390901 120N e Q Search McNees... Books Google Drive C Calculus 8th Edition c Stewart calculus Eaty. Mytab & Mastering I.. C 3rd Edition Textbook Question 9 of 20 Sapling Learning What is the energy required to accelerate a 1675 kg car from rest to 21 m/s? Compared to the amount of energy required to accelerate a car from rest to 21 mis as caloulated above, how much energy is required to accelerate the car starting from 21 m/s to twice that speed, 42 ms? O twice as much O four times as much O three times as much the same Previous 2 Check Answer Next l Ext

Explanation / Answer

initial velocity u = 0

final velocity v = 21 m/s

mass m = 1675 kg

a)

energy E = 0.5mv2 = 0.5*1675*(21)2

E = 369337.5 J

b)

initial velocity u = 21 m/s

final velocity v = 42 m/s

E' = 0.5m(v2 - u2) = 0.5*1675*(422 - 212)

E' = 1108012.5 J

the ratio E'/E = 1108012.5/ 369337.5 = 3

E' = 3E

Ans => three times as much

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