The wave travels at the speed of sound in water:
![v=1500 m/s](https://tex.z-dn.net/?f=v%3D1500%20m%2Fs)
.
The frequency of the wave is
![10 ms^{-1} = 10000 s^{-1} = 10000 Hz](https://tex.z-dn.net/?f=10%20ms%5E%7B-1%7D%20%3D%2010000%20s%5E%7B-1%7D%20%3D%2010000%20Hz)
so we can find its wavelength
![\lambda](https://tex.z-dn.net/?f=%5Clambda)
by using the basic relationship between frequency, wavelength and speed of the wave:
Answer:
Net external force acting on the rock when it is at the top of its trajectory is force due to gravity (mg).
Explanation:
The forces acting on a rock thrown up are force due to gravity and air resistance. Air resistance is directly proportional to velocity of rock, when velocity is zero air resistance is zero. When it is at the top of its trajectory its velocity is zero. So air resistance is also zero. Hence only gravitational force acts on the rock.
Net external force acting on the rock when it is at the top of its trajectory is force due to gravity (mg).
There important because its internaional trade nautrally maps on to a complex network
Because the less dense magma is lighter so it floats to the top.
3499.01 that the exact answer