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A school bus is traveling east in the positive direction of the x axis at 18...

A school bus is traveling east in the positive direction of the x axis at 18 km/h with respect to a car that is traveling in the opposite direction at a speed of 23 km/h with respect to the ground. Find the following:

a. The magnitude of the bus' velocity with respect to the ground.

b. The direction of the bus' velocity.

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