Question

a bird is flying to and fro between two cars a and b moving towards each other on a straight road with speed 18kmph and 36 kmph respectively the bird starts moving from car a toward car b when the two cars were separated by 54 km the displacement of bird till the two cars meet is

Answer 1

Concept of relative velocity (for 1-D): If two objects are moving along the same straight line and we are observing the motion from the frame of one object. Then for the relative velocity, it will be subtracted for velocities in same direction and added for velocities in opposite directions. (Remember: add or subtract them with proper sign conventions).

Answer 2

Answer:

Explanation:

relative velocity =18+36 =54kmph

(moving toward each other)

Time taken by cars to meet at a point =distance /speed = 54/54= 1 hr

Now speed of bird moving from car a is 36 kmph so distance(displacement) travelled by him in 1hr = speed × time = 36 × 1 = 36 km