Bird flying towards its nest with a mass of 0.25kg and a kinetic energy of 40.5j?

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Answer 1 · 2018-05-01T18:30:40

#18 m//s#

#KE = 1/2mv^2#

where

#KE# is kinetic energy in joules #J#

#m# is mass in kilograms #kg#

#v# is velocity in metres per second #m//s#.

i assume that you want to find the bird's average velocity, as that is the only quantity in the kinetic energy equation which is not mentioned.

here, #KE = 40.5J# and #m = 0.25kg#

#1/2mv^2 = 40.5#

#mv^2 = 81#

#m = 0.25#

#mv^2 = 0.25v^2 = 81#

#v^2 = 81 * 4 = 324#

#v = 18#

hence, the velocity #v# is #18 m//s#.