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The velocity of the body moving in a straight line with a constant accelaration, is 10m/sec at a certain instant 't'. After 5sec the velocity become

20m/sec, the velocity 3sec before 't' was:
A). 4m/s
B). 6m/s
C). 7m/s



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U = 10 m/s
v = 20 m/s
time = 5s

a =  \frac{v-u}{t} = \frac{20-10}{5} =2 m/s²

3 second before t,
t= -3
velocity = 10 + 2(-3) = 10-6 = 4m/s

0 0 0
4m/s (Option A)..........

0 0 0
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