Question

From a rifle of mass 4kg a bullet of mass 50g is fired horizontally with an initial velocity of 40ms.calculate the initial recoil velocity of the rifle

Answer 1

$\textbf{\huge{ANSWER:}}$

Mass of the rifle = 4kg (Let = m1)
Initial Velocity of the rifle = 0 m/s (at rest) (Let = u1)
Final Velocity of the rifle = x

Mass of the bullet = 50g
In kg = 0.05kg (Let = m2)
Initial Velocity of the bullet = 0 m/s (at rest) (Let = u2)
Final Velocity of the bullet = 40 m/s ( Let = v)
__________

Momentum before firing:
=》m1 × u1 + m2 × u2
=》(4)(0) + (0.05)(0)
=》 0

Momentum after firing:
=》m1 × x + m2 × v
=》 (4)(x) + (0.05)(40)
=》 4x + 2
__________

Momentum before firing = Momentum after firing
=》0 = 4x + 2
=》(-2) = 4x
=》 (-2)/4 = x
=》 (-1)/2 = x

Therefore;
$\frac{ - 1}{2} \: is \: the \: recoil \: velocity$

Answer 2

Answer:

f

Explanation:

gg