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Friction Help: 1. A car of mass M is moving on a highway. The driver applies...

Friction Help:

1. A car of mass M is moving on a highway. The driver applies the brakes and the car starts to slide. Assuming a coefficient of KF is ‘mu’k, what is the cars acceleration?

2.Two vehicles of mass M and 2M are moving in the same direction on the highway. Both drivers apply their brakes at the same time and both vehicles begin sliding. If the coefficient of KF is the same for both vehicles, how do their accelerations a1 and a2 compare?

3. Block of mass 2 kg is at rest on the surface of a wedge that makes an angle of 30 degrees with the horizontal. The coefficient of static friction is 0.64 and of kinetic friction is 0.42. Draw a free-body diagram.
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