Author Question: A toy rocket with a mass of 300 g takes off in a vertical direction under the influence of gravity. ... (Read 78 times)

PhilipSeeMore · **on:** Jul 29, 2018

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

Question 2

Far from their source, electromagnetic waves are

A)

elliptical waves.
B)

longitudinal waves.
C)

plane waves.
D)

spherical waves.
E)

circular waves.