(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Hi, I have some answers to the following questions but I would just like to know if Im understanding the concepts correctly.

A firefighter climbs up a 100 m ladder leaning against a verticle wall. The ladder makes an angle of 25 degrees with the wal. The firefighter reaches th eroof in 15 seconds.

(a) what is the height of the wall?

(b) how far is the base of the ladder from the wall?

(c) what is the firefighters average verticle velocity?

2. Relevant equations

Pythagorean Theorum - (a^2) + (b^2) = c^2

velocity (v) = distance/time

3. The attempt at a solution

(a) COS = adjacent/hypotenuse

Cos25 degrees = X/10 m

0.91 = x/10m

X= 9.06 m

(b) a^2 +b^2 = c^2

a^2 + (9.06)^2 = 10^2

a^2 +82.08 = 100

a^2 = 17.92

a= 4.2 m

(c) given distance up ladder = 10 m

time = 15.0 seconds

Required: velocity

Analysis: velocity = distance/time =10m/15s = 0.666 m/s

what is the difference between average verticle velocity and resultant velocity???

THanks for the help

Pharm 89

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Motion in a Plane

**Physics Forums | Science Articles, Homework Help, Discussion**