- #1

- 408

- 1

## Homework Statement

## Homework Equations

Wnet = Ek

## The Attempt at a Solution

1) That was fine.

2) I just want to confirm if this answer is right?, I got 12.28N. Used work energy theorem.

Sorry for double post, edited the title

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- Thread starter TheRedDevil18
- Start date

- #1

- 408

- 1

Wnet = Ek

1) That was fine.

2) I just want to confirm if this answer is right?, I got 12.28N. Used work energy theorem.

Sorry for double post, edited the title

- #2

- 37,386

- 7,363

## Homework Statement

## Homework Equations

Wnet = Ek

## The Attempt at a Solution

1) That was fine.

2) I just want to confirm if this answer is right?, I got 12.28N. Used work energy theorem.

Sorry for double post, edited the title

Seems a bit high. Pls post your working.

- #3

- 408

- 1

Seems a bit high. Pls post your working.

Sorry my mistake, forgot something in my calculation. Anyway heres my working

Wnet = Ek

Wg + Wf + Wn = 1/2*m(vf^2 - vi^2)

(5*9.8*sin30*20) - 20Ff + 0 = 1/2*5(12^2 - 6^2)...That 20 is the length of the incline

Ff = 11N.........Now correct?

- #4

- 37,386

- 7,363

Sorry my mistake, forgot something in my calculation. Anyway heres my working

Wnet = Ek

Wg + Wf + Wn = 1/2*m(vf^2 - vi^2)

(5*9.8*sin30*20) - 20Ff + 0 = 1/2*5(12^2 - 6^2)...That 20 is the length of the incline

Ff = 11N.........Now correct?

Yes, that looks right.

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