define average speed .find the average speed at the body if it travels from A to B with n km/hr and returns to A with with Y km/hr.
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it's deifined as the ratio of total displacement to total time that the object taken is k/a average speed.
it's given by;
average speed=2xy÷x+y
where 'x': distance covered towads the pick.
and 'y' stands for : distances covered back to the starting point.
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