Chapter 4
Newton's Three Laws
Part 10

Solution 13

First we need to find the component of the weight. Since we do not know the mass we need to do this algebraically and hope the mass of the seal is not necessary.

The perpendicular component:

The parallel component:

Now use Newton's Second Law:

Yes, the masses cancel out.

Now we need to find out how long it takes the sea lion to go down the ramp. We can use one of the kinematic equations. We know the displacement, the initial velocity, (0 m/s) and the acceleration that we just calculated.

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