Question

Choose the correct statement

a) The speed of an object is the distance covered by it per unit time.

b) Speed has only magnitude.

c) SI unit is m/s

d) All the above

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Answer 1

Explanation:

By reading the above question, we will conclude that it is based on Speed which is a physical quantity in Kinematics. We have to find the correct statement among the options.

So, let's see the options:

a) The speed of an object is the distance covered by it per unit time.

• When we find at what rate we are covering a certain distance, this is known as Speed. Speed is given by Distance / Time. Hence, the statement is correct✓.

b) Speed has only magnitude.

• Since distance and time are also scalar quantities and they are not determined by the direction, Speed is a scalar quantity. Only on the actual path covered is measured. Hence, the statement is correct✓.

c) SI unit is m/s.

• Speed is given by Distance / Time. The unit of distance is metre and the unit of time is second. Hence, the unit of speed = metre/sec (m/s). Hence, this statement is correct✓.

Since all the options (a), (b) and (c) are correct. Collectively we can say that, the correct for all statement is:

$\Large{ \boxed{ \bf{ \red{All \: of \: these(D)}}}}$

And we are done !!

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Answer 2

Answer:

OPTION D WILL BE CORRECT.