5
(iii) 10 Newton
(iv) 30 km/hr
(v) 10 g/cm3
(vi) 20 m/s towards north
Solution
(i) Time-scalar
(ii) Volume-scalar
(iii) Force-vector
(iv) Speed-scalar
(v) Density-scalar
(vi) Velocity-vector
Example 3 In Fig 10 5, which of the vectors are:
(i) Collinear
(ii) Equal
(iii) Coinitial
Solution
(i) Collinear vectors : ,
a cand
rd
r
r (ii) Equal vectors : 
and a
c
r
r
(iii) Coinitial vectors : ,
and