Answer :
Answer:
Velocity of rocket will be equal to 7.81 m/sec
Explanation:
We have given mass of the rocket [tex]m_1=4kg[/tex]
Mass of fuel is given [tex]m_2=50gram=0.05kg[/tex] ( As 1 kg is equal to 1000 gram )
Velocity of fuel [tex]v_2[/tex] = 625 m/sec
We have to find the velocity of rocket [tex]v_1[/tex]
From conservation of momentum we know that initial momentum is equal to final momentum '
So [tex]m_1v_1=m_2v_2[/tex], here [tex]m_1[/tex] is mass of rocket [tex]v_1[/tex] is velocity of rocket [tex]m_2[/tex] is mass of fuel and [tex]v_2[/tex] is velocity of fuel
So [tex]4\times v_1=625\times 0.05[/tex]
[tex]v_1=7.81m/sec[/tex]
So velocity of rocket will be equal to 7.81 m/sec