Because some scientific theories are true and some are false
Force = mass x acceleration
15 = mass x 4
Mass = 15/4
Mass = 3.75 Kg
B hey what do u know i took that test to
Explanation:
Since, it is given that the magnet drops and falls lengthwise towards the canter of the ring. As a result, change in magnetic flux will occur which tends to induce an electric current in the ring.
Therefore, a magnetic field is also produced by the ring itself which will actually oppose or repel the magnet.
Thus, we can conclude that the falling magnet be repelled by the ring due to the magnetic interaction of the magnet and the ring.