- #1

FahimP

- 14

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## Homework Statement

The problem is asking to find the Acceleration vector before jack reaches the less steep section.

the Ans from back of book says : (3.95)i + ( -2.29 ) j

My answer does not match at all : ANY HELP PLZZZZ

anyone know how to get this ?

Two skiers, Annie and Jack, start skiing from rest at different points on a hill at the same time. Jack, with mass 85 kg, skis from the top of the hill down a steeper section with an angle of inclination of 35°. Annie, with mass 70 kg, starts from a lower point and skis a less steep section, with an angle of inclination of 20°. The length of the steeper section is 175 m.

Here is a pic :

http://s172.photobucket.com/albums/w30/afghanplayr/?action=view¤t=8-p-032-alt.gif

Category

## Homework Equations

## The Attempt at a Solution

This is how i tried to find the acceleration vector :

F = mg

F = 85kg( 9.81 ) = 568.98 N

568.98sin(35) = 326.35

568.98cos(35) = 466.05

a = Fnet/m

326.35/85 = 3.83

466.05/85 = 5.48

a= ( 3.83)i + ( 5.48 ) j