I'm going to ignore the <em>sd</em> as a typo and answer the rest of it.
Friction will slow down an object, and the force will create heat to warm the object up. When there's a lot of friction, sound can be heard as more energy is transferred.
Answer:
8/15=0.53..., since the 3 is repeating, just stop at the 4th decimal place, thus
0.5333
Explanation:
Answer:

Explanation:
Mechanical Energy=Potential Energy+ kinetic Energy

To calculate Kinetic Energy:-

To calculate Potential Energy:-

therefore,

The skydiver's total mechanical energy is 459365J
True, an object at rest stays and rest and an object in motion stays in motion