- #1

PhysicsIsKillingMe

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## Homework Statement

A speed of a body of mass 8 kg is 6 m/s in position A. By the time it gets to B, the speed is measured to be 12 m/s. What is the frictional force opposing the motion?

The incline is 30 degrees, the height of the ramp is 12 meters. Position A is at the top of the ramp, position B is at the bottom.

## Homework Equations

[/B]

The coefficient of static friction: µ = tan 30°

## The Attempt at a Solution

[/B]

At first I tried to find the length of the ramp, let it be x.

Sin 30° = 12/X

X = 12/Sin 30°

X = 24 meters

After that I tried to find the coefficient of static friction, which turned out to be tan 1/2. After that I got lost.