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.
Asked by Sunitav2019
25th July 2019,
8:08 PM
Answered by Expert
Answer:
Speed after 25 s = 180 km/h = 180 ×(5/18) m/s = 50 m/s
From equation v = u + a t , we get acceleration. where v is final speed, u is initial speed which is zero because
the car strats from rest, a is acceleration and t is time taken to attain the final speed.
hence v = a t or 50 = a×25 or acceleration a = 50/25 = 2 m/s2 .
distance travelled, S = (1/2)a t2 = (1/2)×2×25×25 = 625 m
Answered by Expert
26th July 2019,
8:39 AM
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