Question

A boy standing on the terrace of 10 storeyed building drops four stones of different mass. At one moment if the stone of 500 g is at 8th floor, stone of 400g is at 6th floor, stone of 1 kg is at 3rd floor and a stone of 6oog is reached at 1st floor. Then at that time, the centre of mass of the system of four stones is at ............ floor. (A) 7th (B) 5th (C) 3rd (D) 4th

Answer 1

Answer:

5th

Explanation:

400g=6th

5

00g=8th

1kg=3rd

600g=1st

8-6=2

2+3=5