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Answers
Answer:
Explanation:
(i)
Acceleration is meant by increase in velocity of the body
From graph one can see during OB velocity increased uniformly
Acceleration = Final velocity - initial velocity / change in time
= (40 - 0 )/ 2 = 20 km/hr^2
(ii)
Retardation is meant by decrease in velocity of the body
From graph we can say that after C velocity decreased
Retardation = Final velocity - Initial velocity / change in time
= ( 0 -40 )/ 2 = -20 km/hr^2
( - ) sign represents negative change in velocity
(iii)
Distance traveled during time OB
s = ut + 1/2 at^2
= 0*2 + 1/2*20*2^2 = 40 km
Distance travelled during BC = v * t = 40*2 = 80 km
Distance traveled after C = Distance traveled during time OB = 40 km
Total distance traveled = 40 + 80 + 40 =160 km