I think is a high-pressure system because it is only in one particular area.
Force = Mass x Acceleration
9N = 0.1kg x Acceleration
Acceleration = 9N / 0.1kg
Acceleration = 90 m/s^2
C. Electromagnetic waves don't always need a medium to travel. Note that they do vary in wavelength and frequency however their speed is fixed. Also, EM waves are always transverse and they consist of vibrating electric and magnetic fields.
Answer:
The person inside the train would see the ball moving straight vertical upward and then vertically downwards also because for a person inside the train, there is only one velocity that could act on the ball and this velocity is downwards.
On the other hand, the person outside the train would see the ball appear to move along the parabolic path because the ball to this person would have two velocities acting on it: the vertical and horizontal components of velocity.
Explanation:
Yes it depend course you throw the stone at the roof it can't came course it in the roof
