An object travels from a point A to B in 20 min, B to C in 30 min and C to D in 10 min in linear direction. If the
distance of A to B is 40 m , B to C is 50m and C to D is 110 m. Calculate the average speed of the object in
Km /hr.
Answers
Answer:
Answer: An object can have zero displacement even when it has moved a distance and shown some displacement. This takes place when the final position of an object coincides with its own initial position. Let's say, if a person moves around circular area and comes back to the place from where he started then the displacement will be zero.
2. A farmer moves along the boundary of a square field of side 10 m in 40 s. What will be the magnitude of displacement of the farmer at the end of 2 minutes 20 seconds from his initial position?
Answer:

Here, Side of the given square field = 10m
so, perimeter of a square = 4*side = 10 m * 4 = 40 m
Farmer takes 40 s to move along the boundary.
Displacement after 2 minutes 20 s = 2 * 60 s + 20 s = 140 seconds
since in 40 s farmer moves 40 m
Therefore, in 1s the distance covered by farmer = 40 / 40 m = 1m
Therefore, in 140s distance covered by farmer = 1 � 140 m = 140 m. Now, number of rotation to cover 140 along the boundary= Total Distance / Perimeter
= 140 m / 40 m = 3.5 round
Thus, after 3.5 round farmer will at point C of the field.
Answer:
An object travels from a point A to B in 20 min, B to C in 30 min and C to D in 10 min in linear direction. If the
distance of A to B is 40 m , B to C is 50m and C to D is 110 m. Calculate the average speed of the object in
Km /hr.