Physics!!!?
An 85 kg fisherman jumps from a dock into a 135 kg rowboat at rest on the west side of the dock. If the velocity of the fisherman is 4.3 m/s to the west as he leaves the dock, what is the final velocity of the fisherman and the boat.
A dry cleaner throws a 22 kg bag of laundry onto a stationary 9 kg cart. The cart and laundry bag begin moving at 3 m/s to the right. Find the velocity of the laundry bag before the collision.
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1. Conservation of momentum, inelastic collision
m1v1=(m1+m2)v2
v2= v1 m1/(m1+m2)
v2= 4.3 x 85 /(85 + 135)=
v2=1.7 m/s
2. Similar to the first problem except it is v1 needs to found.
v1= v2(m2+m1)/m1
v1= 3 ( 22 + 9)/22=4.2 m/s
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