Aschool bus moves past a parked car at a speed of 30 km/hr. which of the following best describes the observation made by a passenger on the bus? a. the car appears to be moving 15 km/hr in the same direction as the bus. b. the car appears to be moving 30 km/hr in the same direction as the bus. c. the car appears to be moving 30 km/hr in the opposite direction of the bus. d. the car appears to be moving 15 km/hr in the opposite direction of the bus.

C.The car appears to be moving 30 km/hr in the opposite direction of the bus.

Explanation:

There are two reference systems involved in this situation:

- Reference system S: this is the reference system where velocities are measured with respect to the ground. In this reference system, the car is parked, so its velocity is

- Reference system S': this is the reference system moving with the bus. This reference system is moving with a velocity of with respect to the reference system S

Calling the velocity of the car in the reference system S', we have:

From which

and the negative sign means that a passanger in the bus observes the car moving in the opposite direction.

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