# To Mr. H's disgust, a 450-g black crow is raiding the recently-filled bird feeder. As Mr. H runs out the back door with his broom in an effort to scare the crow away, it pushes off the 670-gram feeder with a takeoff speed of 1.5 m/s. Determine the speed at which the feeder initially recoils backwards.

1 answer

###### Question:

To Mr. H's disgust, a 450-g black crow is raiding the recently-filled bird feeder. As Mr. H runs out the back door with his broom in an effort to scare the crow away, it pushes off the 670-gram feeder with a takeoff speed of 1.5 m/s. Determine the speed at which the feeder initially recoils backwards.

## Answers

Answer:Actually it's 2.50 m/s, sorryExplanation:It is solved by using momentum conservation equationcombined mass of crow and feeder = 450+670=1120 gmlet the recoil speed of feeder be v m/sThen applying momentum conservation we get;1120×1.5 = 670×vv= 2.50 m/sthe speed at which the feeder initially recoils backwards = 2.50 m/s

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