A Toy Rocket with a Mass of 300 G Takes

Multiple Choice

A toy rocket with a mass of 300 g takes off in a vertical direction under the influence of gravity. It burns fuel at the rate of 25 g/s. The exhaust speed of the gases is 80 m/s. What is the speed of the rocket at the end of 10 seconds?

A) 145 m/s
B) 480 m/s
C) 40 m/s
D) 0 m/s
E) 382 m/s