Physics - Motion - Class - 7 - Selina Solution - ICSE.

 Fill in the blanks using one of the words: at rest, in motion.

(a) a person walking in a compartment of a stationary train is in motion (person) relative to the compartment and is in motion (person) relative to the platform.

(b) a person sitting in a compartment of a moving train is in rest relative to the other person sitting by his side and is. In motion relative to the platform.