Question

From a rifle of mass 4kg, a bullet of mass 50g if fired with an initial velocity of 35m/s. Calculate the initial recoil velocity of the rifle

Answer 1

Answer:There us formula=V gun=M(bullet)×V(bullet)/M(gun)

So, V={50×35}÷4000

=~.45m/s

Explanation:

Answer 2

AnswEr:

$\bf{Masses}\begin{cases}\sf{Mass\:of\:Rifle\:(M)=4kg}\\\sf{Mass\:of\:bullet\:(m)=50g=0.5kg}\end{cases}$

$\bf{Velocity}\begin{cases}\sf{\:Initial\:velocity\:of\:Rifle\:and\:bullet=0}\\\sf{final\:velocity\:of\:bullet=35\:m/s} \end{cases}$

Recoil Velocity of Rifle , v = ?

$\sf\underline{\:\:\:\:\:By\:law\:of\:conservation\:of\:momentum\:\:\:\:\:}$

$\qquad \sf \: mu + mU = mv + mV$

Since, u = U = 0,

$\qquad \sf \: V = \frac{m}{M}v \\ \\ \qquad \rightarrow \sf \frac{0.05}{4} \times 35 \\ \\ \qquad \sf = 0.043 \: ms - {}^{1}$

__________________________

Momentum :

SI unit of momentum is kg m/s.

Momentum is the power of motion of an object.

The product of mass & velocity is called momentum .

Thus, momentum is denoted by p.