FORCE
Level
pending
A BOY DROPS A DUMB BELL OF MASS 10 KG FROM A HEIGHT 80CMWHICH DOES NOT REBOUND . IF THE ACCELERATION DUE TO GRAVITY IS 10M/S^2 THE MOMENTUM TRANSFERRED BY THE DUMB BELL TO THE FLOOR IS ...
35
40
45
20
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1 solution
we know Ek=p^2/2m,or p^2=2mEk,now we know kinetic energy while touching the floor is Ek=Ep=mgh=10 * (8/10) * (98/10)=784/10 J,so p^2=2 * 10 *(784/10) or p^2=1568 so p=40 kgm/s