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A particle of mass 120 g moving at speed of 750 cm/s is acted upon by a variable force opposite to
its direction of motion. If the velocity of the particle becomes 250 cm/s along the direction of force
find the value of time I for which force acted
1) 6sec
2) 9sec
3) 18sec
4) 27 sec
please answer this question correctly as soon as possible
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