A 20.0 g rubber bullet traveling with a velocity of 60.0 m/s hits a stationary 3.00 kg wood block resting on a frictionless surface. The rubber bullet
ricochets off the wood block with a velocity of 40.0 m/s in the opposite
direction.
A. Find the velocity of the wood block.

0.667 m/s

Explanation:

Given that,

Mass of a rubber bullet, m₁ = 20 g = 0.02 kg

Initial speed of rubber bullet, u₁ = 60 m/s

Mass of the wood block, m₂ = 3 kg

Initial speed of the wooden block, u₂ = 0

A rubber bullet hits the stationary wood block. The rubber bullet  ricochets off the wood block with a velocity of 40.0 m/s in the opposite  direction.

Final speed of rubber bullet, v₁ = -40 m/s

Using the conservation of momentum. It will remains conserved. Let v₂ is the velocity of the wood block.

So, the velocity of the wood block is 0.667 m/s.

i dont think you are wrong for wanting to get even with someone who did you wrong.

(i'm an eye for an eye kind of person) but if this person hurt you in a sexual way, i dont suggest doing anything to him. he should be taken to the proper authorities, you could go to jail depending on what you do. if it was something small like your sibling took your spot on the couch, than yea, i would get even with him by taking one of his favorite snacks lol. but i dont suggest you doing anything illegal.