Answer: A unit of measurement which has a fixed value which does not change from person to person or place to place, is called a standard unit of length. It is necessary to have standard units of measurements for the sake of uniformity in measurements.
Answer:
the appearance of shadows changing throughout the day
Answer:
Total displacement will be 1120 meters.
Explanation:
To calculate displacement from the velocity, need to take integral of velocity for a one time period.
The total displacement is 1120 meter in negative way.
Answer:
-8 Kgm/s
Explanation:
From the law of conservation of moentum, the sum of momentum before collision equals the sum of momentum after collision. Therefore
Before collision
Momentum =+15 kgm/s+-35 kgm/s=-20 kgm/s
After collision
Momentum=-12 kgm/s +x kgm/s
x-12 kgm/s=-20 kgm/s
x=-20+12=-8 Kgm/s