The third option is wrong
The second one, the third one, and the last one...i'm not sure about the fourth one...
how many answers can u give?
Answer:
Explanation:
<u>Energy Transformation</u>
Also called as energy conversion, is the process where energy changes from one form to another. There are three types of energy present in this problem. When the object is at rest at the top of the ramp, it has gravitatory potential energy, calculated as
When the object slides down the frictionless ramp, it loses all of the potential energy since it's converted to kinetic energy, given by
Thus
Finally, when the object is in contact with a rough surface, all the energy is transformed into thermal energy. The work done by the friction force is equivalent to the change of kinetic energy, since all the velocity is lost during the process:
Since the kinetic energy is equal to the original potential energy:
The negative sign indicates the work was against the movement, i.e. the force and the displacement are 180° apart.
Note this result does not depend on the distance D needed to stop the block or the coefficient of kinetic friction.
This is biology,
and molecules will move from left to right.
Explanation:
pure definition :
kilo means 1000 (thousand).
so, a km or kilometer is 1000 m or meter.
2000 km = 2000 × 1000 m = 2,000,000 meters