A toy rocket with a mass of 300 g takes off in a vertical ...

[PhilipSeeMore]

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.

[amit]

Answer to Question 1

A

Answer to Question 2

C

[PhilipSeeMore]

Thanks for the timely response, appreciate it

[frankwu0507]

Gracias!