dynamics question problem...

[knight101]

A 6.0 kg box sled is coasting across frictionless ice at a speed of 9.0 m/s when a 12 kg package is dropped into it from above. what is the new speed of the sled ?
seriously confusd :S...

 

[beacon_of_light]

maybe you'll be using law of conservation of momentum ...
momentum before dropping =momentum after...
(6 x 9 ) = ( 6 + 12 ) v ......... where v is the combined velocity of sled & package ...

54 = 18 v
solve it out
u get
v = 3 m/s

..........

 

[hassam]

ya beacon of light is ryt....