Answer:
According to Newton's first law of motion, an object maintains its state unless a force acts on it. Therefore, a moving car does not change its direction and keeps its speed unless a force acts on it.
Heat can be reduced but it cannot be eliminated completely there is some amount if heat energy present even if it is absolute zero(-273degrees Celsius)
Answer: 
Explanation:
Given
Mass of hockey puck 
Initial velocity of hockey puck is 
First a horizontal force of
is applied to the right for 
acceleration associated with it is

Using equation of motion i.e.

(b) When a force of
is applied for 0.05s
Using equation of motion i.e.
