A hockey player skates across a pond with constant velocity v and hits a puck straight ahead toward the goal. We can assume there is no friction.
After the puck is hit, what is the velocity of the center of mass of the hockey player-puck system?
Choose 1
It is equal to the velocity of the hockey puck.
It is equal to half the velocity of the hockey player.
C
It is equal to the original velocity of the hockey player.
It is equal to the new velocity of the hockey player,

Crowbar of 5 metre is used to lift an object of 800 metre if the effort arm is 200cm calculate the force applied

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !

Aball horizontally thrown from a cliff at 8m/s