A450-g black crow is raiding the recently-filled bird feeder. as someone runs out the back door 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.

2.50 m/s

Explanation:

This question can be solved using momentum conservation equation

combined mass of crow and feeder = 450+670=1120 gm

let the recoil speed of feeder be v m/s

Then applying momentum conservation we get;

1120×1.5 = 670×v

v= 2.50 m/s

the speed at which the feeder initially recoils backwards = 2.50 m/s

moving ball hits still ball. mover stops, hit ball moves. momentum transfer.

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