Which option is the most accurate description of speed?

1. the ball rolled down the hill in five seconds to reach the marker.

2. the ball rolled down the five meter hill in five seconds.

3. it took five seconds for the ball to be displaced five meters from the marker.

4.five seconds elapsed as the ball rolled five meters north.

3. It took 5 seconds for the ball to be displaced 5 meters from the marker

Explanation:

Speed is a scalar quantity, it shows how fast an object is moving, it doesn’t show direction of movement of the body in motion i.e the rate at which an object changes its position.

The formula for speed is distance divided by time. The second option gives us the distance covered and the time taken.

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.