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ICSE Class 9 Answered

At a certain instant, an autodriveris driving at a speed of 18 km/hr.then,he uniformly accelarates the auto and after 0 .5 minute the speed of his auto become36 km/hr.what is the average speed of auto?what is the value of uniform acceleration during the given interval of time?state your answer in S.I unit?
Asked by Satyanartan851112 | 12 May, 2019, 08:50: AM
answered-by-expert Expert Answer
Initial speed u = 18 km/hr  = 18×(5/18)  = 5 m/s
 
final speed  vafter 0.5 min = 36 km/hr = 36×(5/18) = 10 m/s
 
average speed = (1/2)(u+v) = (1/2)(10+5) = 7.5 m/s 
 
acceleration a is obtained from the equation  v = u+at  ;     10 = 5+a(30)   or  a = 1/6  m/s2
Answered by Thiyagarajan K | 12 May, 2019, 09:20: AM

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