How would you calculate the speed of an #8.0 times 10^4# kg airliner with a kinetic energy of #1.1 times 10^9#J?

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Answer 1 · 2017-04-15T07:12:39

The speed is #=1.66*10^2ms^-1#

The kinetic energy is

#E=1/2mv^2#

The mass is #m=8*10^4kg#

The energy is #E=1.1*10^9J#

So,

#v^2=(2E)/m#

#v=sqrt((2E)/m)#

#=sqrt((2*1.1*10^9)/(8*10^4))#

#=sqrt2.75*10^2#

#=1.66*10^2ms^-1#