Answer:
B R is constant V increases /increases
Because high school usually starts with students who are above 13 years of age
Answer:
4.9
Explanation:
Velocity half second before maximum height = Velocity half second after maximum height (Return journey)
For downward journey :
Initial velocity u=0 m/s
We have g=9.8 m/s
Time t= ½s
s
Thus velocity after half second v=u+gt
v=0+9.8× ½ =4.9m/s
Answer:
Add
Explanation:
When two forces are acting in the same direction then there magnitude are added to each other
Let the first force is
and second force is
and when they act in same direction then their equivalent will be equal to
![F=F_1+F_2](https://tex.z-dn.net/?f=F%3DF_1%2BF_2)
When they cat in opposite direction then their equivalent will be ![F=F_1-F_2](https://tex.z-dn.net/?f=F%3DF_1-F_2)
A hot air balloon rises in the first place because the air inside is hot, which rises. So, if the air inside is not heated, it fails to rise and falls. Warm air rises because the particles get excited and jiggle with the heat, and cause the air to take up more space. So, as the surrounding air is probably colder and denser, the less dense hot air rises up in the hot air balloon.