Question

an object starts from rest and travel 20m in first and 160m in next 4s.find its velocity 7s after the start

Answer 1

u = 0s1 = 20 ms2 = 160 mt1 = 2 secondst2 = 4 secondss = 20+160= 180 mt = 2+4 = 6 secondss = ut + 1/2at²180 = 0×6 + 1/2×a×6²180 = 18aa = 180/18= 10m/s²t = 7 secondsv = u + at= 0 + 10×7= 70 m/s
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