Question

13. What is the difference between the following two data:
(1) 8 (5 km/hr, east) (ii) (8hr) (5km/hr ,east)?
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Answer 1

Explanation:

i) It is the product of a pure number and a vector (velocity). Hence the unit of product is the same as that of vector, i.e., the product is a velocity of 85 km/h, towards east.

(ii) It is the product of a scalar (time) and a vector

(velocity). Hence the unit of the product will be hX (km/h). Thus the product is a displacement of magnitude 85 km, towards east.