Aball is thrown upwards from the ground of a tower with a speed of 20 metre per second . there is a window in the tower at the height of 15 m from the ground . how many times and when will the ball pass the window?

The field lines around one end of a bar magnet are shown below based on the diagram, what can you conclude about the pole of the magnet? a.is a south pole because the field hnes spread out from this end b.a north pole because the field lines spread out from this end c.a nouth pole because the field lines enter the magnet at this end d.is a north pole because the field lines enter the magnet at this end