2/21/2018 11:59 PM 58/1002/26/2018 05:06 PM PrintCakulator-1 Periocic Table Ques

Question

2/21/2018 11:59 PM 58/1002/26/2018 05:06 PM PrintCakulator-1 Periocic Table Question 17 cf 22 Map Sapling Learning What is energy required to accelerate a 1845 kg car from rest to 27 mis? Number pared to the amount of energy required to accelerate a car from rest to 27 mis as calculated above, much energy is required to accelerate the car starting from 27 mi's to twice that speed, 54 m/s? O three times as much O twice as much O the same O four times as much O Previous ® Gvu Up & View SciutonCheck Anser O Next Exit-.

Explanation / Answer

According to the concept of the work energy therom

Energy E=1/2m(v^2-u^2)

Given that

mass m=1845 kg

initial velocity u=o

finial velocity V=27 m/s

now we find the energy required

energy E1=1/2*1845*(27^2-0^2)=672502.5 J

now we find the energy

energy E2=1/2*1845*(54^2-27^2)=2017507.5 J

E2/E1=(2017507.5/672502.5)=3

E2=3E1

the correct option is one

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