You are playing hockey with friends on a very large frozen pond. the hockey puck is at your feet motionless. you take a slap-shot with your hockey stick and the hockey puck goes zooming off at a high rate of speed sliding along the ice. the hockey puck eventually comes to a stop because:

a. there is no net forward force on the puck and so it will eventually slow down.
b. friction between the puck and the ice will do enough negative work on the puck to equal the positive work done by you on the puck.
c. friction between the puck and the ice will do more negative work on the puck than you did positive work on the puck.
d. friction between the puck and the ice will do less negative work on the puck than you did positive work on the puck.

The correct answer is letter b. Friction between the puck and the ice will do enough negative work on the puck to  equal the positive work done by you on the puck.

Explanation:

According to the Newton's First Law of Motion, the rocky puck would keep sliding on the ice forever. However, due to the friction acts on the puck, it will slow down and eventually stopping.  

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation:

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue