Is it necessary to do work to maintain a constant velocity with a body on a rough. surface?

How can the velocity of a body be changed?

Can the velocity of a body negative or zero ?

Give -the magnitude and direction of the net force acting on a car moving with a constant velocity of 30 km/h on a rough road.

Do action and reaction act on the same body?

Give the magnitude and direction of the net force acting onfa) a drop of rain falling down with a constant speed. (b) a cork of mass 10 g floating on water. (c) a kite skillfully held stationary in the sky. (cf) a car moving with a constant velocity of 30 km/h on a rough road.

What is the angle between frictional force and instantaneous velocity of the body moving on a rough road?

Force can change the velocity of a body. Give one example.

A body of mass 25 g is moving with a constant velocity of 5m/sec on a horizontal frictionless surface in vacuum. What is the force acting on the body?

Can a body have a constant velocity and still have a varying speed ?

It is easier to maintain the motion of a body than to start it. Why?