Question

A bird is tossing (flying to and fro) between two cars moving towards each other on a straight road. One car has a speed of 18 m/h while the other has the speed of 27km/h. The bird starts moving from first car towards the other and is moving with the speed of 36km/h and when the two cars were separted by 36 km. What is the total distance covered by the bird? What is the total displacement of the bird?

Answer 1

Given, Speed of the first car = 18 km/h

Speed of second car = 27 km/h

∴ The relative speed of each car w.r.t each other = 18 + 27 = 45 km/h

Distance between the cars = 36 km

∴ Time of meeting the cars (t) = `"Distance between the cars"/"Relatie speed of cars"`

= `36/45`

= `4/5`h

= 0.8 h

Speed of the bird (v_b) = 36 km/h

∴ Distance covered by the bird = v_b × t = 36 × 0.8 = 28.8 km.