Answer:
As one goes "forward" in time, the second law of thermodynamics says, the entropy of an isolated system can increase, but not decrease. ... Thus, entropy measurement is a way of distinguishing the past from the future.
Explanation:
Answer:
Average speed, 
Explanation:
Given:
- Initial speed, u=40 cm/s
- final speed , v=20 cm/s
- Time taken, t=5 s
<u>First case</u>
Using equation of motion we have

Now using,

now putting the value of a in first equation we get

<u>Second case</u>
Acceleration
Time taken 
using equation of motion in one Dimension we have

Average speed is equal to total distance travelled per unit total time taken

The vector sum of forces acting on a non-accelerating object equals zero.
equation form: ΣF = 0