Time = 1 hour
Acceleration :
a = Vf - Vi / T
a = 5 mm/h - 3 mm/h / 1
a = 2 mm/h / 1
a = 2 mm/h²
hope this helps!
The sum of balanced forces will always be equal to zero.
Answer:
B
Explanation:
When rubbing two sticks together it causes friction witch at fast enough friction rate produces heat energy
Whether a reaction is endothermic or exothermic depends on the difference between the energy needed to break bonds and the energy released when new bonds form. If more heat energy is released when making the bonds than was taken in when they broke, the reaction is exothermic.