Question

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 ?

Answer 1

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

Answer 2

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Explanation: