Black
Explanation : I've tried
Answer:
where F is the friction force that is the same for both boxes
Explanation:
So the same boxes at the same mass m would create a same friction force, let this force be F. The net force in the first and 2nd cases would be
- 1st case: F1 - F
- 2nd case F2 - F
According to Newton 2nd law, this net would make acceleration
- 1st case
- 2nd case
Since
Answer:
Explanation:
The tension of the cord is not important, what matters is the height the block has risen.
When it has risen to its maximum it will have a speed of 0, and because of that it will have a kinetic energy of 0. However it will have a higher potential energy than it had at the beginning. The difference in potential energy will be:
The energy to rise the block with the bullet embedded into it came from the kinetic energy of the bullet.
These two energies are equal because all the kinetic energy the bullet had was transformed into potential energy. Therefore:
Rearranging: