Question

Convert each of the following speed into m/sec:
(i) 72 km/hr (ii) 12.6 km/hr(iii) 23.4 km/hr (iv) 306 km/hr

Answer 1

Answer:

(i) 20 m/s

(ii) 3.5 m/s

(iii) 6.5 m/s

(iv) 85 m/s

i) 72 km/hr

=72×1000/3600 m/s

= 72×10/36 m/s

= 36×10/18

=18×10/9

=20 m/s

(ii) 12.6 km/h

= 12.6×1000/3600

=126/36

=3.5 m/s

(iii) 23.4 km/h

=234/36

=6.5m/s

(iv) 306km/h

=3060/36

=85 m/s

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Answer 2

Answer:

(i) 20 m/s

(ii) 3.5 m/s

Explanation:

(i) 72 Km/ h

72×1000/3600

72 × 10 /36

36× 10 / 18

18 × 10 / 9

Ans:- 20 m/s

(ii) 12.6 Km/h

12.6×1000/3600

126 / 36

Ans :- 3.5 m/ s