The velocity of a body at any instant is 10 m/s .After 5 Dec velocity of particle is 20m/s .The velocity at 3 Dec before is
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accleration =v-u/t
=20-10/5
10/5=2ms^-2
hence velocity 3sec ago 4 ms^-2
=20-10/5
10/5=2ms^-2
hence velocity 3sec ago 4 ms^-2
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