# A weather rocket is launched straight up. Seconds into the flight, its velocity is 130m/s and it is accelerating at 19 m/s^2. At this instant, the rocket's mass is 59 kg and it is losing mass at the rate of 0.55 kg/s. What is the net force on the rocket?

##### 1 Answer

Sep 18, 2015

1049,5 N up

#### Explanation:

Rocket's motion depends on Newton 2 and Newton 3.

At time t, rocket has mass m, moves with velocity

At time

Therefore momentum at time t is

Momentum at time t + dt is

Therefore change in momentum is

This is known as the Rocket Equation and may be used to solve this problem.

Substituting in we get