Question

RY
9.
A bag of mass M hangs by a long thread and a
bullet (mass m) comes horizontally with velocity v
and get caught in the bag. Then for the combined
system (bag + bullet)
mMv
(1) Momentum is
(M + m)
(2) Kinetic energy is =
Mv(M
(3) Momentum is
M
14) Kinetic energy
​

Answer 1

Explanation:

according yo conservation of momentum, the combined mass momentum is same as momentum of bullet before, which is equal to m*v.

Now velocity of combined mass is mv/(m+M).

Kinetic energy = 1/2 * (m+M) * [mv/(m+M)]^2

= (mv)^2/2(m+M)