Physics Please check my answer

1. Which of the following are conserved in a totally inelastic collision?

Only momentum
Only kinetic energy
Both momentum and kinetic energy
Neither momentum nor kinetic energy <---
It depends on the objects.


2. Two skaters stand face to face. Skater 1 has a mass of 55 kg, and skater 2 has a mass of 75 kg. They push off one another and move in opposite directions. What is the ratio of skater 1's speed to skater 2's speed?

1:1
55:75
55:130
75:55
Not enough information to tell <----


3.A massless string connects three blocks,2kg, 4kg, and 6kg, respectively. A force of 24 N acts on the system. What is the acceleration of the blocks and the tension in the rope attached to the 2 kg block?

4 m/s² 12 N
2 m/s² 4 N
2 m/s² 24 N <---
12 m/s² 2 N
4 m/s² 6 N

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  1. 1. MOMENTUM IS SACRED !!!!!!
    If no external force, no change in momentum

    2. 55 V1 + 75 V2 = 0
    V1/V2 = - 75/55

    3. m = 12
    a = F/m = 24/12 = 2 m/s^2

    I can not answer part 2 because I do not have the diagram. However I think your answer unlikely unless that rope pulls on ALL the blocks

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    posted by Damon
  2. Yes, the rope pulls all of the blocks to the right.

    Thank you so much for your help.

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    posted by unknown

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