Question

Items that can be used to explain relative velocity

Answer 1

two trains move side by side or A man walking wrt a person who is standing stationary at a point

Answer 2

$\Large{\underline{\underline{\bf{Solution :}}}}$

★ Relative Velocity :

(i) There is nothing in absolute rest or absolute motion.

(ii) Motion is a combined property of the object under study and the observer.

★ Example :

(i) A book placed on the table in a room is at rest, if it is viewed from the room but it is in motion, if it is viewed from the moon (another frame of reference). The moon is moving w.r.t. the book and the book w.r.t. the moon.

(ii) A robber enters a train moving at great speed with respect to the ground, brings out his pistol and says " Don't move, stand still".

The passengers stand still. The passengers are at rest with respect to the robber but are moving with respect to the rail track.

(iii) Relative motion means, the motion of a body with respect to another. Now if $\sf{\vec{V_A}}$ and $\sf{\vec{V_B}}$ are velocities of two bodies relative to earth, the velocity of B relative to A will be given by :

$\sf{ \vec{V_{BA}} = \vec{B} - \vec{A}}$