6. A boy drives his scooter with a uniform speed of 45 km h-1. Find :
(i) the time taken to cover 900 m.
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Answer:
Step-by-step explanation:
if the speed is uniform, acceleration will be equal to zero"0"
use
s=ut+1/2at^2 to find the time (40km/h=12.5m/s)
s= ut+1/2at^2
900 = 12.5*t +1/2*0*t^2
900= 12.5t
900/12.5=t
t=72s
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