A4.0 kg model rocket is launched, shooting 50.0 g of burned fuel from its exhaust at an average velocity of 625 m/s. what is the velocity of the rocket after the fuel has burned?

Velocity of rocket will be equal to 7.81 m/sec

Explanation:

We have given mass of the rocket

Mass of fuel is given ( As 1 kg is equal to 1000 gram )

Velocity of fuel = 625 m/sec

We have to find the velocity of rocket

From conservation of momentum we know that initial momentum is equal to final momentum '

So , here is mass of rocket is velocity of rocket is mass of fuel and is velocity of fuel

So

So velocity of rocket will be equal to 7.81 m/sec

v=ir = 3x15 =45 v