How Is the Rocket's Acceleration Calculated After the Parachute Opens?

[TyErd]

Homework Statement

What is the acceleration of the rocket at a time of 5seconds after the parachute opens.

Homework Equations

F=ma

The Attempt at a Solution

I simply thought the acceleration would be 9.8m/s/s

 

[Mark44]

Homework Statement

What is the acceleration of the rocket at a time of 5seconds after the parachute opens.

Homework Equations

F=ma

The Attempt at a Solution

I simply thought the acceleration would be 9.8m/s/s

That would be the acceleration acting downward if there were no parachute. The retarding force R of the parachute acts upward, in the opposite direction of the gravitational force acting on the rocket.

 

[Mintea]

You also have to take into consideration the resistance force on the parachute; that will affect the acceleration.

 

[TyErd]

so the resistance force of the parachute is 1.8N. So I know its going to be F-1.8=mass(which I forgot to mention but its 0.2kg) * acceleration., But how do I calculate the upwards acceleration

 

[Mark44]

F = ma, so a = F/m. What's the net acceleration, and in what direction?

 

[TyErd]

would the net acceleration be 1.8/0.2?

 

[Mark44]

No, that's the acceleration upward. The net acceleration would be the vector sum of the upward and downward accelerations.

 

[TyErd]

ohh so a=(9.8-1.8)/0.2