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a car started from rest and reaches a speed of 150 km in 1 by 6 hour what is the acceleration of the car in kilometre per hour |
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Answer» -step explanation:Givenv=36kmh −1 = 360036000 =10ms −1 s=9km=9000mThis MOTION is in three phases.[Case: 1] with ACCELERATION, a=0.2ms −2 and intial velocity , u=0Thus using equation v=u+at10=0+0.2×tSo, t=50 s[Case: 2]uniform motion with velocity ,v=10 and distance, s=9000Thus time , t= vs = 109000 =900 s[Case: 3]With acceleration, a=−0.1ms −2 u=10ms −1 and v=0Thus using equation v=u+at0=10−0.1×tSo, t= 0.110 =100 sThereforeTotal time = 50s+900s+100s=1050sSo, option A is correct |
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