- #1

bob24

- 14

- 0

## Homework Statement

A medical helicopter weighs 7000 lbs. How much upward force must the propeller supply for it to lift off at 10ft/sec(squared)?

## Homework Equations

T-w=ma, w=mg

## The Attempt at a Solution

Here is what I tried:

T-w=ma.....w=mg---7000=m(32.2)=217.39k

T-7000= 217.39(-10ft/s)

T=4826.1

What am I doing wrong here? Shouldnt the acceleration be a negative value since it is going upward? and what should the actual final answer be?