Question

An empty sled of mass M moves without friction across a frozen pond at speed v0. Two objects are dropped vertically into the sled one at a time: first an object of mass m and then an object of mass 2m. Afterward the sled moves with speed vf. What would be the final speed of the sled if the objects were dropped into it in reverse order?

Answer 1

Answer:Same final speed

Step-by-step explanation:

Given

sledge of Mass M is moving on friction less frozen pond at speed
`v_0`

Two masses are dropped vertically into the sled one at a time

final speed of the sled will be same irrespective of order of dropping because final momentum will be same. Adding mass will reduce momentum of the sled. Finding velocity by conserving momentum will give the velocity of sled after first and second drop and reversing the problem will give same final velocity
`v_f`