Question

give the magnitude and direction of the net force acting on a stone of mass 0. 1 kg just after it is dropped from the window of a train accelerated with 1 metre per second square

Answer 1

HELLO THERE!

When a stone is inside a train accelerating with 1 ms⁻², then it has a Force acting on it in horizontal direction, which is equal to :

F = m a (a = acceleration of train)

= 0.1 kg x 1 ms⁻² = 0.1 N

However, when the stone is thrown from the window, there is no effect of this force acting in the horizontal direction.

So, the acceleration now acting on the body will be acceleration due to gravity, which is equal to 10 ms⁻².

So, the net force acting on the body when it is thrown, is:

F = mg (According to Newton's Second Law of Motion)

=> F = 0.1 kg x 10 ms⁻²

=> F = 1 N

So, your answer is 1 Newton.

HOPE THIS HELPS...

Thanks!