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Assertion: When an object is accelerating, it is either speeding up or slowing down. Reason: When an object moves on a circular path with uniform speed, the object accelerates.

Which speed is measured by the speedometer of your scooter?

A boy travelling in an open car moving on a levelled road with constant speed tosses a ball vetically up in the air and catches it back. Shetch the motion of the ball as observed by a boy stanceing on the footpath. Give explanation to support your diagream.

The mode of propagation used by short wave broadcast services having a frequency range from a few 3 MH_z "up to 30" MH_z is