Question

car 1 drives 45 mph to the west and car 2 drives 30mph to the east . from the frame of reference of car 1, what is the velocity of car 2

Answer 1

Answer:

15 mph west

Explanation:

Velocity of car 1 with respect to ground, V1,o = 45 mph west

Velocity of car 2 with respect to car 1, V2,1 = 30 mph east

Take east direction as positive direction and west direction as negative direction.

By use of formula of relative velocity,

Velocity of car 2 with respect to car 1 is given by

V2, 1 = V2,o - V1,o

30 = V2,o - (-45)

V2,o = 30 - 45 = - 15 mph

It means the velocity of car 2 with respect to ground is 15 mph towards west.

Answer 2

Distance between the two cars is increasing at the rate of 85 mph. 

A passenger in Car-1 says that he is at rest in his own frame of reference,
and Car-2 is moving away from him at 85 mph, toward the west.