race car accelerates on a straight road from rest to 180 km per hour in 25 seconds asuming uniform acceleration find distance covered in this time
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A car accelerates uniformly on a straight road from rest to speed of 180km h-1 in 25 s. Find the distance covered by the car in this time-interval. ... hence v = a t or 50 = a×25 or acceleration a = 50/25 = 2 m/s2 .
Explanation:
Given: u=0;v=180km/h=50m/s;t=25s.
From 1st Equation of Motion,
v=u+at
50=0+a×25
a=2m/s^2.
From 3rd Equation of Motion,
s=ut+ 1/2at^2
=0×25+1/2×2×(25)^2
=625m=0.625km
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