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# Edexcel M2 Question watch

1. Hi, I have a homework question as follows:

A smooth slope is inclined at to the horizontal. A body of mass 4kg is released from rest at the top of the slope and reachers the bottom with speed 7 m/s. Find the length of the slope.

This is meant to be done using energy and work done.

I am not entirely sure about all the forces here. Will the tractive force T include the 4g or be as well as it? Am I on the right track?

2. 1. Find the resultant of the forces along the plane. Smooth, no friction, so the resultant is simply a component of weight.
2. Use F=ma to find acceleration.
3. Use uvast to calculate the distance.
3. Or if you use energy and work done (didn't read your post fully) then it would be KE=GPE to get a vertical height. That and the angle is enough to work out the hypotenuse.
4. (Original post by bendent1234)
Hi, I have a homework question as follows:

A smooth slope is inclined at to the horizontal. A body of mass 4kg is released from rest at the top of the slope and reachers the bottom with speed 7 m/s. Find the length of the slope.

This is meant to be done using energy and work done.

I am not entirely sure about all the forces here. Will the tractive force T include the 4g or be as well as it? Am I on the right track?

Since it's a smooth slope you have GPE Lost = KE Gained.

And they're the only two things you need to worry about. You don't need to work out the component of weight down the slope - energy takes care of all that for you.
5. Thanks

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