I'm having trouble with this problem:

79g-88=79a

a=8.6861m/s^2

this is the correct acceleration i believe and to find final velocity i used:

Vf^2=Vi^2+2ad where d is displacement

Vf^2=2(8.6861)(25)

vf=20.85m/s

I'm using utexas's webhw service, and the answer above was not correct, can someone tell me what i'm doing wrong?

So for this problem i used F=ma:"A 79kg person escapes from a burning building by jumping from a window 25m above a net.

The acceleration of gravity is 9.81 m/s^2

Assuming that air resistance is a constant 88 N force on the person during the fall, find the person's velocity just before hitting the net"

79g-88=79a

a=8.6861m/s^2

this is the correct acceleration i believe and to find final velocity i used:

Vf^2=Vi^2+2ad where d is displacement

Vf^2=2(8.6861)(25)

vf=20.85m/s

I'm using utexas's webhw service, and the answer above was not correct, can someone tell me what i'm doing wrong?

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