Question

define following 1 distance 2 displacement 3 speed 4 velocity 5 average speed

Answer 1

the length of path covered by a body is known as distance.
the length of path covered by a body initial position to final position is known as displacement.
distance per second is known as speed.
or the rate of change of distance is known as speed.
displacement per second is known as velocity.
or the rate of change of displacement is known as velocity.
the ratio of Total distance covered by a body to the total time is known as average speed.

Answer 2

1. distance - it is the total path length covered by an object during a given time.
2. displacement - it is the shortest distance covered by an object from its initial      position to its final position during a given time.
3. speed - it is defined as distance per unit time.
4. velocity - it is defined as displacement per unit time. 
5.average speed - it is defined as the ratio of the total distance to the total time     given.