I think it is liters, cubic meters, or milliliters.<span />
Answer:
Conservation of Energy: the total energy of the system is constant. Conservation of Momentum: the mass times the velocity of the center of mass is constant. Conservation of Angular Momentum: The total angular momentum of the system is constant.
Explanation:
none
Answer:
Value of acceleration in each case is 
Explanation:
According to newton's law :
...equation 1.
In the given case,
Force by both the children - Friction force .

Putting value of F in equation 1.

Now, if friction force = 20 N.
Therefore, 
Putting value of F and a in equation 1.

Hence , this is the required solution.
Because both materials hold in the heat differently. Therefore, their temperature would not rise at the same rate.