Draw the diagram and solve:

A robin with a mass of $77$g sights a bird feeder hanging from a tree. The robin flys directly into the feeder, causing it to move up by $5\mathrm{.}5$cm$.$ If The mass of the bird feeder is $250$g$,$ what was the initial velocity of the robin?

Answer rating: 100% (QA)

Because we are dealing with an inelastic collision the bird and the feeder move together after the collision and gravitational potential energy the bi... View the full answer