Question

An athlete travels in a circle track of radius 14m. Find the distance and displacement when he completes: a)Full-circle b)Half circle​

Answer 1

Explanation:

Distance is the actual length of path covered by the object during its motion.

Displacement is the shortest path between initial and final positions of the object.

On completing a full circle initial and final points become same and hence displacement becomes zero, whereas distance covered by object is the circumference of the circular track that is

=2πr

=2π(14) = 28π m

On completing half circle the object reaches at diametrically opposite end from the point of start. Hence displacement is equal to diameter

that is = 2r = 2(14)= 28 m

while distance is half if circumference

= πr = 14π m