A 70Kg person jumps out of a plane and deploys a parachute, once the parachute is open the wind resistance acting on the person and the parachute is 900N. What is the direction and magnitude of the persons acceleration.

We start off by working out all the forces acting on the person and they're parachute, because they are joined together they can be considered as one object. We know the wind resistance and the only other force acting on them is the weight of the man (we assume the parachute is weightless). So the total weight is found using F = Ma. M is mass so is 70Kg and a is gravity so is 9.8m/s^2. Therefore the weight acting down is 686N. To find the acceleration we again use F = Ma but this time F is the resultant force acting on the person. So the resultant force is weight - wind resistance (we assume down is positive direction). Therefore the resultant force is 686 - 900 = -214. By rearranging the equation to get a = F/M the accleration can be worked out as -214/70 = -3.06m/s^2. And the negative sign indicates it is acting upwards i.e slowing the person down.

Answered by Joe C. Physics tutor

9666 Views

See similar Physics GCSE tutors

Related Physics GCSE answers

All answers ▸

What is meant by 'resolving a vector into its components'?


Calculate the total resistance across AB; between A and B are two parallel branches, one branch with a 3 Ohm and a 5 Ohm resistor, the other branch with a 4 Ohm resistor.


What is cosmic microwave background, and where does it come from?


Describe the difference between reflection and refraction (assume the mediums have smooth surfaces)


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo
Cookie Preferences