class - 7
science
ch- 13 - time and motion
the speed of a moving a car is 85kmper hour. calculate its speed in meter per second
kaiwalyakool:
just do it - 85×5/18 and your answer is 23.6m/s
Answers
Answered by
111
Solution:
First Method:
Given Speed = 85 km/hr
This means that, the car travels 85 km in 1 hour.
Now the question asks us to find the speed in meters per second.
So, 85 km is equal to 85,000 m and 1 hour is equal to 3600 seconds.
Hence the speed of car in meters per second is 85000 / 3600 which is 23.61 meters per second.
Alternative Method:
A simple shortcut to solve all these problems is to use direct formula. If you wish to conceptually solve, then the first method is apt.
Second method:
Direct Formula : 1 km/hr = 5/18 m/s
Hence, 85 km/hr would be 85 × 5/18 which is 425/18 which is 23.61 m/s
Hence the car travelled 23.61 m/s
Answered by
109
Solutions :-
Given :
The speed of a moving a car is 85 km per hour.
We know that,
1 km = 1000 m
By unitary method,
85 km = 85 × 1000 = 85000 m
1 hr = 60 minutes
By unitary method,
1 minute = 60 seconds
1 second = (60 × 60) = 3600 seconds
Find the speed of moving car in m/sec :-
Time = 3600 seconds
Distance covered in one hr or 3600 seconds = 85000 m
Speed of moving car = Distance / Time
= 85000/3600 m/sec
= 23.61 m/sec (approx.)
Hence,
Speed of the moving car in m/sec is 23.61 m/sec.
Given :
The speed of a moving a car is 85 km per hour.
We know that,
1 km = 1000 m
By unitary method,
85 km = 85 × 1000 = 85000 m
1 hr = 60 minutes
By unitary method,
1 minute = 60 seconds
1 second = (60 × 60) = 3600 seconds
Find the speed of moving car in m/sec :-
Time = 3600 seconds
Distance covered in one hr or 3600 seconds = 85000 m
Speed of moving car = Distance / Time
= 85000/3600 m/sec
= 23.61 m/sec (approx.)
Hence,
Speed of the moving car in m/sec is 23.61 m/sec.
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