Physics

Problem

A spacecraft, of mass

12500 \text{ kg}

, has a rocket engine that ejects

4.0 \text{ kg}

of hot gas every second at a speed of

250 \text{ ms}^{-1}

. Calculate a. the force on the spacecraft. b. the acceleration of the spacecraft. c. the impulse felt by the spacecraft if the rocket engine were used for a time of

20 \text{ s}

. d. the change in speed of the spacecraft.

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