suppose you walk across a room of length 9 m with a velocity of one and a half kilometer per hour .
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deepikakvvk06
24.05.2017
Physics
Primary School
A Suppose you walk across a room of length 9m with a velocity of one and a half kilometre per hour.
Express this velocity in m/s and find the time you will take to move across the room ?
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vishagh
vishagh
Displacement=9 m
Velocity= 1.5 km/ hr
1 \frac{km}{hr} = \frac{1000 m}{60 * 60 sec} = (1000/3600)m/s
=5/18 m/s
To convert km/hr to m/s , just multiply the given value of km/hr by 5/18
1.5 km/hr = 1.5×5/18 = 0.4166 m/s
velocity=displacement/Time
Time=Displacement/velocity
=9/0.4166
=21.603 sec
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