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ICSE Class 10 Answered

A car of mass 50kg travels from rest and acquires a velocity of 40m/s in 20s.Find the acceleration gained by the car and the work done in bringing the car to rest.
Asked by rkarim957 | 11 May, 2020, 01:34: PM
answered-by-expert Expert Answer
v equals u plus a t 40 equals 0 plus a cross times 20 a equals 2 m s to the power of negative 2 end exponent W o r k space d o n e space t o space b r i n g space t h e space c a r space a t space r e s t equals space C H a n g e space i n space k i n e t i c space e n e r g y equals K subscript f minus K subscript i equals 1 half m v squared subscript f minus 1 half m v squared subscript i equals 1 half cross times 50 cross times 0 minus 1 half cross times 50 cross times 40 squared equals negative 40 comma 000 J S o space m a g n i t u d e space o f space w o r k space d o n e space i s equals 40 k J
Answered by Utkarsh Lokhande | 11 May, 2020, 02:11: PM

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