An object starting from rest travels 20m in first 2 sec and 160m in next 4 sec what will be the velocity after 7sec after the start
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u = 0
s = a×t²/2
==>20 = a×2×2/2 = 2a
==>a = 10 m/s²
v = speed at 7th second
v= u + at = 0 + 10×7
==> v = 70 m/s
s = a×t²/2
==>20 = a×2×2/2 = 2a
==>a = 10 m/s²
v = speed at 7th second
v= u + at = 0 + 10×7
==> v = 70 m/s
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