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An object starting from rest travels 20 meter in first 2 seconds and 160 meter in next 4 seconds. What will be the velocity after 7 seconds from the start?
u=0
S=20 m
t=2 s
ie 20=(1/2)*a*2*2
a=(20*2)/4
 =10  m/s^2
{you don't need the 160 m at 4 seconds data, it's just there to give you an alternative way of solving this}
so at t = 7 seconds
v = u + a t ,but u = 0 
v = a t = 10 x 7 
v = 70 m/s


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