Question
A body moves at a speed of 20 km h−1 for the first 2 hours. After that, it moves at the speed of 30 km h−1 for the next 1 hour. What is the total distance travelled by the body?
Answer: Option B
:
B
From definition of speed,
Distance = Speed × Time
The total distance will be the sum of the distances travelled in both the time intervals.
In the first part of motion,
Speed=20kmh−1,Time=2s
Distance travelled:
D1=20×2=40km
In the second part of motion,
Speed=30kmh−1,Time=1s
Distance travelled:
D2=30×1=30km
Hence, total distance: D=D1+D2=70km
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:
B
From definition of speed,
Distance = Speed × Time
The total distance will be the sum of the distances travelled in both the time intervals.
In the first part of motion,
Speed=20kmh−1,Time=2s
Distance travelled:
D1=20×2=40km
In the second part of motion,
Speed=30kmh−1,Time=1s
Distance travelled:
D2=30×1=30km
Hence, total distance: D=D1+D2=70km
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