Explanation:
initial velocity U = 20m/s
Final velocity V = 35m/s
time = 15.0 secs
change in velocity = 35 - 15
= 20m/s
acceleration a = change in velocity/time V/t
a = (35-20)/15
a= 15/15
Hence, your acceleration is 1m/s^2
Answer:

Explanation:
Given that
At X=0 V=Vo
At X=X1 V=0
As we know that friction force is always try to oppose the motion of an object. It means that it provide acceleration in the negative direction.
We know that



So the friction force on the box
Ff= m x a

Where m is the mass of the box.
There must be movement in the same direction as the force put on the object. Hope this helps!
Answer:
a and b are the correct answers
Explanation:
Answer:The change in entropy of the total amount of water is negative as a result of the mixing.
Explanation:If you increase temperature, you increase entropy
Also More energy gives you greater entropy and randomness of the atoms.