a 10,000kg rocket changes speeds with a thrust of 300,000N applied for 6 seconds. If a negligible amount of fuel is lost during the rocket firing, what is the change in speed of the rocket?

Answer 1

Since you know the applied force and its duration, you can work this as an impulse problem. Using the approximation that the mass is constant,

F = applied force (given)

t = duration of applied force (given)

m = mass (assumed constant, given)

Δv = change in speed = ?

Impulse:

Ft = mΔv ⇒

Δv = Ft/m

Plug in the numbers and get Δv in m/s.