Calculating Work and Kinetic Energy on an Inclined Plane

[takelgith]

Summary:: I have done parts a-d but I can't seem to get e correct!

A 6.10 kg block is pushed 9.00 m up a smooth 38.0 ∘ inclined plane by a horizontal force of 78.0 N . If the initial speed of the block is 3.20 m/s up the plane.

a. Calculate the initial kinetic energy of the block. (found to be 31.2 J)
b. Calculate the work done by the 78.0 N force. (found to be 553 J)
c. Calculate the work done by gravity. (found to be -331 J)
d. Calculate the work done by the normal force. (found to be 0 J)
e. Calculate the final kinetic energy of the block. ( HELP)

I tried maybe doing like a net work thing. Where I added all the works together and equated to kinetic energy. so:

Ek would be: 31.2 +553 -331 = 253.2

I need to know if this is correct beforehand, because I only have 1 attempt left!

[Moderator's note: Moved from a technical forum and thus no template.]

 

[PeroK]

Summary:: I have done parts a-d but I can't seem to get e correct!

A 6.10 kg block is pushed 9.00 m up a smooth 38.0 ∘ inclined plane by a horizontal force of 78.0 N . If the initial speed of the block is 3.20 m/s up the plane.

a. Calculate the initial kinetic energy of the block. (found to be 31.2 J)
b. Calculate the work done by the 78.0 N force. (found to be 553 J)
c. Calculate the work done by gravity. (found to be -331 J)
d. Calculate the work done by the normal force. (found to be 0 J)
e. Calculate the final kinetic energy of the block. ( HELP)

I tried maybe doing like a net work thing. Where I added all the works together and equated to kinetic energy. so:

Ek would be: 31.2 +553 -331 = 253.2

I need to know if this is correct beforehand, because I only have 1 attempt left!

Looks right. Why would you doubt it?

 

[Vanadium 50]

He explained why. He wants us to check it before he submits it as his own work.