Question

The SI unit for the resultant velocity is:
(A) m/s
(B) km/s
(C) cm/s
(D) min/s

Answer 1

Hint: To answer this question we have to first define the term resultant velocity and find out the quantities which forms it. From the SI unit of the quantities that make up resultant velocity we can determine the SI unit of resultant velocity as well. To be specific in this case it is displacement and time. So we should be familiar with the SI units of displacement and time to write the required answer.

Complete step by step answer:
We should know that velocity is given as displacement by time.
We know the SI unit of displacement is meter and that of the time is given by seconds. So since velocity is defined as displacement / time we can say the SI unit of velocity is m/s.
It is known to us that resultant velocity is a combination of 2 or more than 2 velocities. Therefore, we can say that the unit of resultant velocity, according to the law of addition quantities of similar units should be added or subtracted and the resultant will be of the similar unit.
So the SI unit of resultant velocity will also be similar to that of velocity which is m/s.

Hence the correct answer is option A.

Note: We should be knowing the definition of resultant velocity for better understanding. So resultant velocity is defined as the result of the vector sum of two or more than two vectors. In case the addition is between two or more vectors then the resultant will be the resultant vector and in case it is between 2 or more forces then the addition result will be called as resultant force.