Inclined plane problem without mass or coefficient of friction given

[ineedhelpthanks]

Homework Statement

A Yukon Hammerhead sled is at the top of an icy hill. The hill was conveniently measured by a surveyor who determined it to have an angle of 18° with the horizontal. Height of the hill is 25 m. What is the speed of the sled as it reaches the bottom of the hill?

Relevant Equations

I know I need to use kinematic equations to help find the speed.
I need to find fg to find the fnetx and fnety, but I’m confused how to approach this.

Confused how to approach problem after making a free body diagram and finding the length of the inclined plane

 

[Doc Al]

So you made a free body diagram? Good! Realize that the net force will be parallel to the incline -- find that force, then use Newton's 2nd law to find the acceleration.

 

[PeroK]

Homework Statement:: A Yukon Hammerhead sled is at the top of an icy hill.

I wonder what it means by "icy"?

 

[ineedhelpthanks]

I wonder what it means by "icy"?

Yeah, I think it’s regarding the friction. I think for the problem the friction is neglected

 

[ineedhelpthanks]

So you made a free body diagram? Good! Realize that the net force will be parallel to the incline -- find that force, then use Newton's 2nd law to find the acceleration.

Okay, I’m not sure how f=ma would work without the mass though

 

[Doc Al]

Okay, I’m not sure how f=ma would work without the mass though

Just call the mass "m" and see what happens. You might not need it to find the acceleration. (The expression for force will also involve the mass.)

 

[hutchphd]

Were you told to use kinematics to solve this? Energy conservation is easier.

 

[Keith_McClary]

Energy conservation is easier.

And you don't even need the angle!

 

[kuruman]

Were you told to use kinematics to solve this? Energy conservation is easier.

The right kinematic equation (the one that does not involve $t$) works just as well.