- #1
sid123
- 2
- 0
problem -
a bullet of mass .012kg and horizontal speed 70meters per second strikes a block of mass 0.4 kg and instantly comes to rest with respect to the block. the block is suspended from the ceiling by means of thin wires . calculate the height through which it rises.
attempt -
total initial energy = 1/2(mv^2)=1/2*.012*70*70
total final energy = mgh=(0.012+.4)*10*h
equating the 2 .
i get 7.5 meteres but the answer given is 21.2 cm .
pls help .
a bullet of mass .012kg and horizontal speed 70meters per second strikes a block of mass 0.4 kg and instantly comes to rest with respect to the block. the block is suspended from the ceiling by means of thin wires . calculate the height through which it rises.
attempt -
total initial energy = 1/2(mv^2)=1/2*.012*70*70
total final energy = mgh=(0.012+.4)*10*h
equating the 2 .
i get 7.5 meteres but the answer given is 21.2 cm .
pls help .