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An object starting from rest travels 20m in first 2sev and 160m in next 4sec what will be the velocity after 7sec
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The presented formulation has a number / a lot of deficiencies.
1. The formulation does not say that the motion is uniformly accelerated.
(Otherwise the problem doesn't make sense). So, this assumption MUST be added.
And if it is so, then the initial velocity is zero and the acceleration is a = 10 m/s^2.
2. What are these "next 4 seconds" ?? - Are they 3-rd, 4-th, 5-th an 6-th seconds (if to understand it literally as it is written) ??
Then it is consistent with a = 10 m/s^2, but then this part is unnecessary, excessive and carries ZERO additional information.
After saying all of that, I have no any desire to work on it further.
The problem MUST BE RE-EDITED to be considered.
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The solution is based on the formula S = 
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