The stone covers a total angular displacement of 2*pie in one
revolution.So in 25 rev, it will cover a total disp of 25*2*pie.
the angular velocity == TOTAL DISP/TOTAL TIME TAKEN. Now accln of
the stone ==(ANGULAR VELOCITY)^2*RADIUS.....................
all stones accumilate at center stone..
70+70+70+(60+60+60+60)+(50+50+50+50)+(40+40+40+40)+....................(10+10+10+10+) =1050 metres min distance we have to cover
bullet has so hign speed that its impulse is too low because time off impact is too less. .but stone has sufficient time of impact so. it will act on the glass .Therefore according to newtons 3rd law glass react and breaks itself.
got it??