Question

Convert the following speeds into m/sec :
(1) 72 km/h (11) 9 km/h (ii) 1.2 km/minute
Convert the following speeds into km/h
(iv) 600 m/hour.​

Answer 1

(i) 72 km/h

1 km = 1000 m and

1 hour = 3600 sec

Hence,

1 km / h = (1000) / (3600)

= (5 / 18) m/s

Therefore,

72 km/h = (5 / 18) × 72 m/sec

We get,

= 20 m/ sec

(ii) 9 km/h

1 hour = 3600 sec

1 km = 1000 m

1 km / m = (1000) / (3600)

We get,

= (5 / 18) m/s

Therefore,

9 km/h = (5 / 18) × 9 m/sec

We get,

= (5 / 2)

= 2.5 m/ sec

(iii) 1.2 km/minutes

1 hour = 60 minutes

1.2 km/min = 1.2 × 60 km/h

Now,

1 km/ h = (5 / 18) m/s

1.2 × 60 km/ h = 1.2 × 60 × (5 / 18) m/sec

= 72 × (5 / 18) m/sec

We get,

= 20 m/sec

(iv) 600 m/ hour

= (600) / (1000) km/h

= {(600 × 5) / (1000 × 18)} m/sec

We get,

= (1 / 6) m/sec

Answer 2

Step-by-step explanation:72 x 5 upon 18 equals to 4 multiply by 5 which is equals to 20 m per second answer is 20 m/s.9 x 5 upon 18 which is equals to 2.5 m per second. answer is 2.5 m per second1.2 x 60 x 5 upon 18 which is equals to 72 into 5 upon 18 which is equals to 20 m per second answer is 20 m per second600 upon 1000 which is equals to 600 into 5 upon 1000 into 18 which is equals to 1 into 1 equals to 2 into 3 which is equals to 1 upon 6 Answer is 1 upon 6 m per second Thank you