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## Homework Statement

Basically i need to find the braking distance and time for the deceleration of a vehicle for the following conditions,

using a parachute

using a parachute, and wheel brakes

does anyone know of a suitable formula to calculate this?

## Homework Equations

Fd=0.5CdPAu^2 - drag force from parachute

Fw= Constant - brake force at wheels - Ive already calculated this to be in the region of 7000N - though this number is likely to change

## The Attempt at a Solution

Basically i have the following differential equation, which im not sure if it is correct, it has also been a very long time since i solved a differential equation:

M d2x/dt^2 + P dx/dt + B = 0 where M is the mass, Fd is the drag force from the parachute and Fw is constant force (brakes.)

if this is correct, how might i go about calculating a stopping distance, and time to stop?

Many Thanks

Ed

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