Question

A. A train runs from New Delhi to Kolkata. It first covers a distance of 400 km in 7 hours and then a distance of 550 km in 8 hours.
B. Ratna takes part in a car race. She drivers a distance of 70 km in the first, second and third hours.

(a) A is an example of uniform motion and B is an example of non-uniform motion.
(b) A is an example of non-uniform motion and B is an example of uniform motion.
(c) A and B are examples of uniform motion.
(d) A and B are example of non-uniform motion.

Answer 1

(b) A is an example of non-uniform motion and B is an example of uniform motion.

A. Speed of the train in the first part of the journey = 400/7
= 57.14 km/h

Speed of the train in the second part of the journey= 550/8
= 68.75 km/h (∵ Speed = Distance/Time)

In both the parts, the train has different speeds. Hence, this is an example of non-uniform motion.

B. Ratna travels a distance of 70 km in the first, second and third hours. It means that she is travelling equal distances in equal intervals of time. In other words, she is travelling at a constant speed. Thus, this is an example of uniform motion.