Question

Paco No
A bullet
of 50 gram fried with 200 ms
embeded
box suspended
by
thread
up to
which box will
bullet.
Calculate height
nise along
of box
with bullet​

Answer 1

Answer:

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Explanation:

Initially only the bullet is moving with velocity 200m/s ,later the block and velocity move with some velocity v which can be found from conservation law of momentum:

0.05×200+5×0=(5.05)×v

10=5.05v

v=5.0510=1.98m/s

Due to this velocity the block has gained kinetic energy ,therefore because of energy conservation it will reach till the point its potential energy equals this kinetic energy.

Therefore,bevause of energy conservation ,

Initial energy=Final energy

0=KE+PE

KE=PE

21mv2=mgy

y=2gv2=0.2m

Also, y=l(1−cosθ)

cosθ=1−ly=ll−y

=1010−0.2=0.98

θ=cos−1(0.98)=11.48∘