Question

The basic unit of speed is:
(i) km/min
(ii) m/min
(iii) km/h
(iv) m/s
NCERT Solutions for Class 7th Science Chapter 13 Motion and Time Page 157 Exercise Question 9

Answer 1

(iv) m/s The basic unit of distance is metre (m). The basic unit of time is second (s). Therefore, the basic unit of speed is m/s.

Answer 2

Speed is a scalar unit which represents the magnitude of any object's velocity ,in terms of kinematics.

Unlike any other scalar unit speed also has different units for calculation.

But the SI unit of any scalar is known as the basic unit of that particular scalar.

The SI unit of speed is metre per second.

That's why the correct answer is,Option D = m/s.