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Position and Movement Question 3
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最佳解答:
change 60km/h into ms-1 60 X 1000/3600 = 16.67 90 x 1000/3600 = 25 120 x 1000/3600 = 33.33 The quesiton ask for the average acceleration fo the sports car, therefore it is a = initial and final / time taken 33.33 - 16.67 / (5+7) = 1.39ms-2 therefore the ans is D
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Position and Movement Question 3
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3) A sports car accelerats from 60km/h to 90hm/h in 5s and then from 90km/h to 120km/h in a further 7s . What is the average acceleration of the sports can ? A 5ms-2 , B 2.78ms-2 , C 1.43ms-2 , D 1.39ms-2 , Ans = D最佳解答:
change 60km/h into ms-1 60 X 1000/3600 = 16.67 90 x 1000/3600 = 25 120 x 1000/3600 = 33.33 The quesiton ask for the average acceleration fo the sports car, therefore it is a = initial and final / time taken 33.33 - 16.67 / (5+7) = 1.39ms-2 therefore the ans is D
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