Question

A model rocket with the initial mass of 3.0 KG is Lunch horizontally by burning and 640 g of fuel with the velocity of 5.1 m/s. what is the velocity of the rocket after the fuel is expelled

Answer 1

From the law of conservation of momentum, the velocity of the rocket after the fuel is expelled is 1.09 m/s.

What is the velocity of the rocket after the fuel is expelled?

The law of conservation of momentum is employed in determining the velocity of the rocket after the fuel is expelled.

According to the law of conservation of linear momentum:

• m1v1 - m2v2 = 0

where;

m1 be the mass of the rocket = 3.0 kg

m2 - the mass of fuel = 640 g or 0.64 kg

v1 - velocity of the rocket after the fuel has been expelled

v2 - average velocity of expelled fuel = 5.1 m/s

making v1 subject of the equation of the conservation of momentum

v1 = v2*m2 / m1

v1 = 5.1 * 0.64/3

v1 = 1.09m/s

Therefore, the velocity of the rocket after the fuel is expelled is 1.09 m/s.

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