1. The small rocket engines used in model rockets are rated by the impulse they exert on the rocket. The graph below shows the force exerted by an engine during the 1.0 second from when it is ignited until when the fuel is completely burned. F (N) a) What is the impulse of this rocket engine? 1 t (s) 0.2 0.4 0.6 0.8 1.0 b) One of these engines is put horizontally on a frictionless cart of mass 780 g so that it will accelerate the cart. How fast will the cart be going after the engine has burned all of its fuel? The mass of the engine itself is small enough that we can ignore it.

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