Two point cars approach each other with constant speeds 12 m/s and 8 m/s from an initial separation of 200 m. A bird of speed 30 m/s starts from the first car, repeatedly flies to the other car and reverses instantaneously on reaching it. Which statements are correct?
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Question

Two point cars approach each other with constant speeds 12 m/s and 8 m/s from an initial separation of 200 m. A bird of speed 30 m/s starts from the first car, repeatedly flies to the other car and reverses instantaneously on reaching it. Which statements are correct?

Select all that apply

G1 Physics · Accepted Answer

Closing speed of cars=20 m/s, so collision time=200/20=10 s. Bird distance=30×10=300 m. With point cars and instantaneous reversals, flight times form a decreasing sequence and infinitely many legs fit into the finite 10 s interval. Thus D is false.