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Q.

Velocity of a particle moving with uniform acceleration at some instant is 10 m/s.  After 5 seconds from that instant its velocity becomes 20 m/s.  Its velocity 3 seconds before the instant is

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a

8 m/s

b

4 m/s

c

6 m/s

d

7 m/s

answer is B.

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Detailed Solution

v=u+at  :   20=10+5 a  ;   a=2 velocity 3 sec before v=u-at ;  v=10-3×2= 4 m/s
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Velocity of a particle moving with uniform acceleration at some instant is 10 m/s.  After 5 seconds from that instant its velocity becomes 20 m/s.  Its velocity 3 seconds before the instant is