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