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A car of mass 1metric ton starts from re...

A car of mass `1metric` ton starts from rest and accelerates to a speed of `72km//h` in `20 sec`. It then moves with a constant velocity for `80 sec`. And is bought to rest in next `10 sec`, (figure). Caculate the force acting on the car from (i) 0 to `20 sec` (ii) 20 to `100 sec` (iii) 100 to `110 sec`

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