15 degrees because a glass of water won't do anything to a bath tub of 15 degree water
It is a mechanical wave and cannot travel through a vacuum.
The work required to raise an object to a height is equal to the gravitational potential energy the object gains. <em>(C)</em>
Free fall without air resistance:
g=9.81 m/s²
t=235 s
h=?
h=0.5*g*t²
h=0.5*9.81*235²
h=270879m =270 km
