An object starts from rest and travels 20m in first we and 160m in next 4s. Find its velocity 7s after start.
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u=0 , s=20m , t=7s
a =v-u/t
10= v-0 / 7. (a=g=10m/s^2)
10=v/7
10 into 7= v
70m/s v
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