Two bullets of the same size, mass and horizontal velocity are fired at identical blocks, only one is made of steel and the other is made of rubber. The steel bullet has a perfectly inelastic collision with the block, while the rubber bullet has an elastic collision. Which bullet is more likely to knock over the block, or are both equally likely to do so

Rubber bullets.

Explanation:

Given that Two bullets of the same size, mass and horizontal velocity are fired at identical blocks, only one is made of steel and the other is made of rubber. The steel bullet has a perfectly inelastic collision with the block, while the rubber bullet has an elastic collision. 

both will not equally likely to do so because in elastic collision, both momentum and energy are conserved while in inelastic collisions, only momentum is conserved while energy is not.

Therefore, the rubber bullet is more likely to knock over the block than the steel bullet because there will be no loss of energy in the rubber collision

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

hope this !

come closer and become far apart and become steam/gas