Rank the following objects in order from lowest kinetic energy to highest kinetic energy. Indicate a tie with an equal sign. an object of mass m traveling with a speed v
an object of mass 2m traveling with a speed v
an object of mass m traveling with a speed 2v
an object of mass ½m traveling at speed 2v
an object of mass 2m traveling at speed ½v

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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we're given that v₀ = 0 and a = 5.4 m/s². therefore, since v = at + v₀ for constant acceleration the equation for velocity is

after 28s,

m/s

which i would round to 150 m/s as my final answer