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If a car which is at rest suddenly accelerates at 24km/hr. after travelling for 6 hrs. What will be its final velocity |
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Answer» tion:Speed of car for first 30 minutes = 30 km h^{-1}h−1Speed of car for NEXT 1 hour = 40 km h^{-1}h−1(a) total distance travelled by the carFirst caseSpeed = distance / timedistance = speed x time= 30 x 0.5 ---- (30 MIN = 0.5 hour)= 15 km ---- (i)Second casespeed = 40 km h^{-1}h−1distance = 40 km x 1= 40 km ---- (II)ADDING (i) and (ii)Total distance = 15 km + 40 km= 55 km(b) total time of travel = 0.5 hr + 1.0 hr = 1.5 hr(c) average speed = total distance travelled/total time taken= 5.5 km/ 1.5 hr= 36.67 km h^{-1}h−1 |
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