(about as class 9th science book lesson 9 ) From a rifle of mass 50g is fired with an initial velocity of 35m/s. Calculate the initial reevil velocity of the rifle ?
Answers
Correct question.
From a rifle of mass 4 kg a bullet of mass 50 g
is fired with an initial velocity of 35 m/s.
calculate the initial recoil velocity of the rifle.
EXPLANATION.
mass of rifle = M1 = 4 kg
mass of the bullet = M2 = 50g = 0.05 kg
bullet is fired with an initial velocity =
=> V2 = 35 m/s
initially, rifle is at rest
Therefore,
initial velocity = 0
Total initial momentum of a rifle and a
bullet system =
=> ( M1 + M2) v = 0
Total momentum of a rifle and a bullet system
after firing = M1V1 + M2V2
=> 4( v1) + 0.05 X 35
=> 4v1 + 1.75
According to the law of conservation of
momentum.
Total momentum after firing = Total momentum
before firing.
=> 4v1 + 1.75 = 0
=> v1 = -1. 75/4
=> v1 = -0. 4375 m/s
negative sign indicated that the rifle recoil
backwards with a velocity = -0. 4375 m/s
Therefore,
initial recoil velocity of rifle = -0. 4375 m/s
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