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hey I will help u firstly you can find acceleration of the two speeds or v by t and here this is not the case of retardation as velocity is increasing in time results increasing and not decreasing ok and any third question in this you have to give time after thatwe know the distance is always speed into time of velocity into time from in next case you will do this .in question 50 you can find distance by multiplying speed and time from B to c use formula of acceleration to find acceleration of D and b is just a different my language but actually you have to find only acceleration after that you can find distance as comparing first distance and second distance you can solve this thank you so much ......
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