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let's. The the time 2second (A) and 5second (B) and 7 second (C) and 8second (D)
according to the first question velocity of A to B=
3-0/5-2= 3/3= 1m/s
according to the second question velocity of B to C=
zero because there is no displacement according to the time
according to the third question the velocity of C to D=
0-3/10-7 =3/3 = 1 m/s .
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