Kinematics Reasonings

Can a body have a constant velocity but varying speed?

No. Speed of a body is the overall distance travelled per unit time; irrespective of its direction. Velocity of a body is the overall displacement occured per unit time; with regard to its direction. If a body is moving with a constant velocity, then its magnitude and direction remain constant. Speed is the magnitude of velocity. Therefore, speed also remains same.

[Read: Motion in a Straight Line]


Can the direction of velocity of an object change keeping the acceleration constant?

A player hits a baseball at some angle. The ball goes high up in space. The player runs and catches the ball before it hits the ground. Which of the two (the player or the ball) has greater displacement?

If a particle is accelerating, it is either speeding up or speeding down. Do you agree with this statement?

The velocity of a body will be changed in magnitude and direction while its acceleration is constant. Is it possible?

Is it possible for a body to have a constant speed in an accelerating motion?

A boy wants to take his boat to a point just opposite on the other bank of the river with water flowing its usual course. How should he row and why?