Converting km/h to m/s (āĻ—āĻ¤āĻŋ āĻāĻ•āĻ• ā§°ā§‚āĻĒāĻžāĻ¨ā§āĻ¤ā§°)





Converting km/h to m/s (āĻ—āĻ¤āĻŋ āĻāĻ•āĻ• ā§°ā§‚āĻĒāĻžāĻ¨ā§āĻ¤ā§°)


Main Rule: m/s = km/h × 5/18


Why ?



  • 1 km = 1000 m

  • 1 hour = 3600 s


Therefore, 1000 / 3600 = 5/18


So, km/h → m/s = × 5/18


Examples

i. Convert 36 km/h into m/s


Soln


36 × 5/18 = 180/18 =10 m/s


Ans: 10 m/s


ii. Convert 54 km/h into m/s

Soln


54 × 5/18 = 270/18 


Ans: 15 m/s


iii. Convert 72 km/h into m/s

Soln


72 × 5/18 = 360/18 


Ans: 20 m/s


Reverse Rule: To convert m/s to km/h: km/h = m/s × 18/5


Example


Convert 20 m/s into km/h.


20 × 5/18


Ans: 72 km/h


Trick (āĻŸā§ā§°āĻŋāĻ•): i. km/h → m/s = × 5/18,  ii. m/s → km/h = × 18/5


Remember: i. "Go Down → × 5/18" (km/h → m/s),  ii. "Come Back → × 18/5" (m/s → km/h)


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MCQs on Conversion of km/h to m/s (āĻ—āĻ¤āĻŋ āĻāĻ•āĻ• ā§°ā§‚āĻĒāĻžāĻ¨ā§āĻ¤ā§° MCQs)












1. What is the formula to convert km/h into m/s ? (km/h āĻ• m/s āĻ˛ā§ˆ ā§°ā§‚āĻĒāĻžāĻ¨ā§āĻ¤ā§° āĻ•ā§°āĻŋāĻŦāĻ˛ā§ˆ āĻ•ā§‹āĻ¨āĻŸā§‹ āĻ¸ā§‚āĻ¤ā§ā§° āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻ•ā§°āĻž āĻšāĻ¯āĻŧ ?)


a) × 18/5  b) × 5/18  c) ÷ 18/5  d) × 1000


Ans: b) × 5/18


Explanation: km/h → m/s āĻ•ā§°āĻŋāĻŦāĻ˛ā§ˆ 5/18 ā§°ā§‡ āĻ—ā§āĻŖ āĻ•ā§°āĻž āĻšāĻ¯āĻŧāĨ¤


2. Convert 36 km/h into m/s.

a) 5 m/s  b) 10 m/s  c) 15 m/s  d) 20 m/s


Ans: b) 10 m/s


Explanation: 36 × 5/18 = 10 m/s


3. Convert 54 km/h into m/s.

a) 12 m/s  b) 14 m/s  c) 15 m/s  d) 18 m/s


Ans: c) 15 m/s


Explanation: 54 × 5/18 = 15 m/s


4. Convert 72 km/h into m/s.

72 km/h = ? m/s


a) 18 m/s  b) 20 m/s  c) 22 m/s  d) 24 m/s


Ans: b) 20 m/s


Explanation: 72 × 5/18 = 20 m/s


5. Convert 90 km/h into m/s.

a) 20 m/s  b) 22 m/s  c) 25 m/s  d) 30 m/s


Ans: c) 25 m/s


Explanation: 90 × 5/18 = 25 m/s


6. What is the rule for converting m/s into km/h ? (m/s āĻ• km/h āĻ˛ā§ˆ ā§°ā§‚āĻĒāĻžāĻ¨ā§āĻ¤ā§° āĻ•ā§°āĻžā§° āĻ¨āĻŋāĻ¯āĻŧāĻŽ āĻ•āĻŋ ?)

a) × 5/18  b) × 18/5  c) ÷ 18  d) × 100


Ans: b) × 18/5


Explanation: m/s → km/h āĻ•ā§°āĻŋāĻŦāĻ˛ā§ˆ 18/5 ā§°ā§‡ āĻ—ā§āĻŖ āĻ•ā§°āĻž āĻšāĻ¯āĻŧāĨ¤


7. Convert 20 m/s into km/h.

a) 54 km/h  b) 60 km/h  c) 72 km/h  d) 90 km/h


Ans: c) 72 km/h


Explanation: 20 × 18/5 = 72 km/h


8. Convert 15 m/s into km/h.

a) 45 km/h  b) 54 km/h  c) 60 km/h  d) 72 km/h


Ans: b) 54 km/h


Explanation: 15 × 18/5 = 54 km/h


9. 1 km is equal to:

1 km = ?


a) 10 m  b) 100 m  c) 1000 m  d) 10000 m


Ans: c) 1000 m


Explanation: 1 kilometer = 1000 metersāĨ¤


10. 1 hour is equal to:

a) 60 s  b) 600 s  c) 3600 s  d) 1000 s


Ans: c) 3600 s


Explanation: 1 hour = 60 minutes = 3600 seconds.


Tough Question


11. A car moves at 108 km/h. Its speed in m/s is:

a) 25 m/s  b) 30 m/s  c) 35 m/s  d) 40 m/s


Ans: b) 30 m/s


Explanation: 108 × 5/18 = 30 m/s


Trick :

  • km/h → m/s = × 5/18

  • m/s → km/h = × 18/5

  • "Go Down → × 5/18"

  • "Come Back → × 18/5"