- #1

- 1

- 0

## Homework Statement

What is the speed after 5 seconds?

**Given**Box1 : 400 kg

Box2: 100 kg

Initial velocity: 20 m/s

μk: .30

Angle of Incline: 25

Time: 5 seconds

## Homework Equations

Force of Friction: (mg)(cos θ)(μ)

Effective Gravity: (mg)(sinθ)

F=ma

Vf = Vi + at

## The Attempt at a Solution

For Force of friction I got 1066.9055

For Effective Gravity I got 1658.3540

Then I added the weight from the 100 kg block

Then I did Fnet = -1066.91-1658.35 + 981 = 500a

a = -3.49

Vf = Vi + at

Vf = 20 + (-3.49)(5)

Vf = 2.55

I'm not sure if this is correct