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If a car at rest accelerates uniformly to a speed of 144 km/h in 20 sec, it covers a distance of:
Asked by Abhishek123pop | 15 Sep, 2019, 22:47: PM
answered-by-expert Expert Answer
Let us convert the speed in its SI unit. 
144 km/h = 144 × (5/18) = 40 m/s 
 
u = 0, v = 40 m/s, t = 20 s 
v = u +at 
40 = 0 + a (20)
40 =20 a 
a = 2 m/s2 
 
Thus, the total distance covered is, 
s = ut +1/2 at2 
s = 0 + 1/2 (2) (20)2 = 400 m 
 
Thus, s= 400 m 
Answered by Shiwani Sawant | 16 Sep, 2019, 12:07: PM
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